Switch Barrel Set Up Pros and Cons

B

BLOODHOUND BRO

Private
Minuteman
Apr 12, 2018
8
1
#1
With a $600 stock, $1000 action and a $1500 scope, I can only afford 1 custom rifle, which is why I think many people, like me, are considering switch barrel rigs. The following threads seem to have some great info, but I wanted to start a thread to discuss the pros and cons of the various set ups in one place.

http://www.snipershide.com/shooting/threads/switch-barrel-setup.6885121/
http://www.snipershide.com/shooting/threads/switch-barrel-technology.6529522/
http://www.snipershide.com/shooting...-prefit-switch-barrel-testing-review.6582532/
http://www.snipershide.com/shooting...est-action-for-a-switch-barrel-build.6473249/

I plan on purchasing a Bighorn SR3 (I am mainly interested in WSM/SAUM hunting cartridges for a lightweight LRH rig) with interchangeable bolt heads (.223, Standard and magnum). Since this is the action if have decided on, I have left out the switch barrel options of AI, Curtis Custom, surgeon, etc. My main goal is to be able to switch barrels without removing the scope, while maintaining consistent head space through barrel swaps. I have outlined my own interpretations through my research below. Please feel free to add to and/or correct my assumptions as I have not used any of these systems and it is my goal to understand each of them better.

WTO Switch Lug
Pros -
No scope removal
Hand tighten (no vise, action wrench)
Constant head space
Very little/no special inlet for stock
No contour limitations
Con-
Lack of thread engagement, potential pin shear
will need custom barrel fitting (no prefit)

ARC Barloc
Pros -
No scope removal
Hand tighten (no vise, action wrench)
Constant head space
Very little/no special inlet for stock
No contour limitations
Full thread engagement with cone tension
Some prefits available (ie. PVA)
Con-
Some Pre-fits may not have long enough threads on shank for Barlok

Bugnut
Pro -
Full thread engagement
very little/no special inlet for stock
Constant headspace (w/Loctite?)
No contour limitations
Pre-fits available
Con-
Must remove scope?
Need barrel vise/action wrench/bugnut wrench

Shouldered Barrel w/witness or index marks
Pros-
Full thread engagement
Constant Headspace
No scope removal
Pre-Fits available
No contour limitations
no special inlet
Cons-
Need barrel vise/action wrench

Savage/Remage Barrel Nut w/Loctite
Pros-
Full thread engagement
Constant Headspace (w/Loctite)
Pre-fits available
Cons-
Need barrel vise/action wrench/barrel nut wrench
Must remove Scope
Barrel contour limitations
May be need additional stock inlet

I think I am in between the Barloc and shouldered barrels with index marks for the time being. Would love to have some insight from people who are actually using these switch barrel set ups. Thanks in advance.
 
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#2
The ARC Barloc or the shouldered barrel would be my only choice. The Barloc is going on my rifle as soon as I get time. I'm swapping shouldered barrels from the 22x47L, 6x47L, 7SAUM. The shouldered barrels and Barloc is the only way to get tension on the threads and shoulders for consistency. Changing scope windage and elevation is the only issue, but in my case it's repeatable. With the Vortex scope and the LTEC it's easy to move it.
 
#3
Your zero will change with barrel swaps so not sure why not removing scope is a requirement? I still think shouldered barrels are your best bet.
 
#4
Bar lock is nifty but not aesthetically pleasing to some. Best option is shouldered. You don’t always have to crank a shoulder barrel down. Some times a snap of your wrist will get you in the game with zero tools needed. Maybe a combo of both would be best in this case.
 
#6
I'm going to use a Barloc on a Nucleus with Savage pre-fit barrels. This combo seems to be the most compatible with off the shelf parts (due to the bolt face to action face measurement).

No barrel chambering and threading required because a pre-fit already has it.

I plan to use witness marks to try to time the barrel exactly before and after a swap but I might go a little further, loktite the barrel nut and create some sort of jig to hold the barrel nut and receiver in alignment while the Barloc is being tightened.

If timing is maintained, the curve of the barrel will be in the same plane so your dope shouldn't change much after you re-zero.
 
#7
BLOODHOUND BRO said:
From what I've read, there is a zero shift, but in a lot of cases, it can be logged and repeatable. With scope removal/re-installation, this will not be the case.
Click to expand...


....I mean, that is what QD mounts are for. Spend on a Bobro QD mount, and your scope mounting return to zero issue is 99.99% solved. Testing showed <.1moa repeatable zero shift, and if you want even less SPHUR makes a QD mount too.

My vote is shouldered on an action where you don't need a smith to spin it up every time to your individual spec (like the Bighorn). If it is on a savage or Tikka or similar action, get a prefit with a barrel nut instead.
 
#8
Barloc user here. On my shouldered barrel, return to zero is within probably 1/2 MOA from one install to the next. I shot 5x, 3 shot groups at 100 with a barrel removal/install in between each and it printed a 1.6"ish 15 shot total group.

Barloc with a savage-style nut seems to be much more picky. Where the nut clocks pushes POI around and in my case I can move windage around 4-5 MOA based on where the nut clocks.

To be very clear, in either case, once the Barloc is tightened, zero does not move around. This is only from one install to the next that I'm talking about shifts. And this is only 1 or 2 outings worth of data. Going to be a busy couple weeks ahead, but by mid June I should have some more testing done. My SPR Bartlein .260 prefit shot a couple .58-.63" 10-shot groups at 100yd the other day with 7fps SD (random load, virgin brass, bullets I have never used before in this barrel), and I won a local 200-1200yd PRS style match this weekend so the accuracy and zero-holding is there for sure with the Barloc.

ETA: I got the Barloc not so much to switch barrels out "often", but more to save me the headache of having to send the action off and wait for rebarreling. With that in mind, and understanding a quick zero-check is in order each time to fine-tune things, I'm pretty happy with the Barloc.
 
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#9
I vote shouldered as well. You don't need witness or index marks, just a torque wrench. It's going to be the most solid, most fail safe and reliable system available. Anything that requires the user to set headspace with a go-gauge and some sort of locking device has greater potential for user error or at least less consistent headspace.

Since you've decided on Bighorn SR3 for the action, a key question is whether the gunsmiths who do TL3 shouldered barrels w/o needing the action can do a barrel for the SR3. In other words, do the TL3 and SR3 headspace and index the same? I would call Bighorn/Zermatt and ask because that affects your options for getting a barrel. There are some low cost options for a full shouldered TL3 barrel, and my guess is that those may work on the SR3 as well. Not sure though...

There are two main reasons you would want to start to mess with all the other devices that use some sort of locking barrel nut or add-on. The first and main reason is cost - buying a cheap prefit blank like a criterion. The second is convenience, since some of those devices allow for barrel swaps without pulling the action out of the stock, which saves maybe 5 minutes.

The cost side of things can be matched or beat by the TL3 shouldered prefit options (if they fit the SR3). The convenience side of things can be matched or beat by an approach like outlined in this thread...

http://www.snipershide.com/shooting...ystem-tl3-xlr-evo-6-dasher-223-wylde.6667070/

And if you don't need to swap barrels on the fly at the range then it's no big deal if you spend 5-10 minutes taking the action out of the stock and change barrels at home in the traditional fashion before you go shoot.

Side note, I think a lot of zero shift repeatability can come from taking the action out of the stock and putting it back in the exact same way. A bedded stock will have a bit of an advantage there, but that's another thing you need to be consistent on for how you torque the stock back in the action.
 
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#10
A switch barrel using a device like a Barloc has a lot more convenience than just being able to rebarrel without removing the action from the stock/chassis.

If you can install and remove a barrel without an action wrench or barrel vise, that is very convenient no matter where you swap the barrel.

I'll probably remove my action from its chassis any time I switch barrels so that I can use a witness mark underneath the barrel that the chassis will hide.

Taking five minutes to do that is far less inconvenient than bringing a barrel vise and action wrench out in the field or or even rebarreling in a shop if you have to use a barrel vise and action wrench.
 
#11
Sheldon N said:
The cost side of things can be matched or beat by the TL3 shouldered prefit options (if they fit the SR3). The convenience side of things can be matched or beat by an approach like outlined in this thread...

http://www.snipershide.com/shooting...ystem-tl3-xlr-evo-6-dasher-223-wylde.6667070/
Click to expand...

That setup is extremely interesting. Seems like the best of all worlds. Only thing I can see being an issue is placing 50-100 ft lbs of torque on the end of the barrel with smaller contours. Obviously is hasn't been an issue for him with that repeatability.
 
#12
Sheldon N said:
Since you've decided on Bighorn SR3 for the action, a key question is whether the gunsmiths who do TL3 shouldered barrels w/o needing the action can do a barrel for the SR3. In other words, do the TL3 and SR3 headspace and index the same? I would call Bighorn/Zermatt and ask because that affects your options for getting a barrel. There are some low cost options for a full shouldered TL3 barrel, and my guess is that those may work on the SR3 as well. Not sure though...
Click to expand...

Great point, I just got off the phone with Bighorn - the SR3 and TL3 do headspace and index the same, so pre-fits are good to go. The only reason I went with SR3 is that I am looking to run BDL.

Thanks for the comment.
 
#14
Sheldon N said:
Since you've decided on Bighorn SR3 for the action, a key question is whether the gunsmiths who do TL3 shouldered barrels w/o needing the action can do a barrel for the SR3. In other words, do the TL3 and SR3 headspace and index the same? I would call Bighorn/Zermatt and ask because that affects your options for getting a barrel. There are some low cost options for a full shouldered TL3 barrel, and my guess is that those may work on the SR3 as well. Not sure though...
Click to expand...
TL3 and SR3 SHORT Actions have the same head space dimensions and indexing. The same is true with the TL3 and SR3 LONG Actions. The SA's and LA's, however, are NOT the same.

A little behind the scenes look here...action blanks are made with all features needed prior to becoming "a real action" in large lots controlling the dimensional tolerance and indexing. Once that is done, we have the ability to make any one of our 120 different short action or 84 different long action configurations in to the "real action" you all receive.

Thanks - Ray
 
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#15
Glad this popped up. Been looking at these ideas over the last year. I really like the flats idea. What about carbon fiber barrels? Obviously you can do it the old fashioned way, was wondering if anybody has tried something different with them.
 
#16
Ledzep said:
ETA: I got the Barloc not so much to switch barrels out "often", but more to save me the headache of having to send the action off and wait for rebarreling. With that in mind, and understanding a quick zero-check is in order each time to fine-tune things, I'm pretty happy with the Barloc.
Click to expand...
That is exactly the functionality I am looking for out of the Barloc... my experience with other, "designed-in" quick-change barrel setups (DTA, AIAT) is very similar. When going from barrel to barrel on a DTA or AIAT, my experience is that you'll be on paper at 100 yards, but will need to set the final zero via the optic.

Overall, it's something I can live with, given the other advantages of the system(s).
 
#17
FYI, you can have flats milled just behind the muzzle threads (or muzzle if not threaded) into your shouldered barrels. This allows you to use a crows foot and torque wrench. No vice/scope removal/chassis removal required.

This also allows you to purchase used barrels already shouldered for your Bighorn that aren’t spaced for the barloc. Just have a smith mill the flats in.
 
#19
Bartlien will manufacture a barrel for you with a shank diameter larger than 1.25", at no additional cost. Call them up and ask them if they will keep the breech shank "as large as possible". Large as possible means the diameter that the breech first cleans up to run true in their lathes. When I ordered my barrel, they told me to expect a breech shank diameter around 1.290" to 1.300".

The blanks they use to manufacture their barrels with evidently come with diameters a little larger than 1.300". When the exterior is turned down to running true to center in their lathe, they typically measure 1.290" to 1.300" in diameter.

Oh..., this was for a stainless steel barrel. I can't speak to their CM barrel blanks. Best to talk with them to confirm what is possible.

My .338 SS Bartlein barrel has a breech shank diameter of ~1.303". I wanted a little larger than 1.25", which is the minimum recommended by BAT. Some gunsmiths feel the additional breech shank diameter is helpful to stable accuracy...
 
#20
I'm considering barloc myself. It is my understanding that you still need to use a headspace gauge / GO-NO GO gauges to set your headspace everytime. It is not as simple as an AI AXMC / AX barrel swap. You need to be precise as to set your headspace the same everytime so you are not jumping around on your headspace which there chances your jump to lands which could throw off the accuracy of your ammo.

I have a friend that has a Defiance Deviant switch barrel setup and loves it. He uses a standard action wrench to change barrels. He has:

.223AI
6mm Creedmoor
.260 rem
.308
6.5 SAUM

he runs shouldered barrels and just screws them back in and since they are shouldered the headspace is not an issue to return to easily


On another note, even though the TL3 actions are INSANELY consistent action to action Josh at PVA I believe measures your specific action (if bought through him) and saves info so you can just literally call him and order a barrel that screws in with perfect headspacing

I think machined flats are they way to go. It would be nice to see a long term test on a shouldered barrel taken off and torqued down an excessive amount of times to see if it has any detrimental effects to the barrel.
 
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#21
Longshot85 said:
I'm considering barloc myself. It is my understanding that you still need to use a headspace gauge / GO-NO GO gauges to set your headspace everytime. It is not as simple as an AI AXMC / AX barrel swap. You need to be precise as to set your headspace the same everytime so you are not jumping around on your headspace which there chances your jump to lands which could throw off the accuracy of your ammo.

I have a friend that has a Defiance Deviant switch barrel setup and loves it. He uses a standard action wrench to change barrels. He has:

.223AI
6mm Creedmoor
.260 rem
.308
6.5 SAUM

he runs shouldered barrels and just screws them back in and since they are shouldered the headspace is not an issue to return to easily


On another note, even though the TL3 actions are INSANELY consistent action to action Josh at PVA I believe measures your specific action (if bought through him) and saves info so you can just literally call him and order a barrel that screws in with perfect headspacing

I think machined flats are they way to go. It would be nice to see a long term test on a shouldered barrel taken off and torqued down an excessive amount of times to see if it has any detrimental effects to the barrel.
Click to expand...

They will measure at PVA and keep on file if you want them to(as will any Smith). They will also make you a barrel to the standard TL3 spec sight unseen.

Barloc with a shouldered barrel instructions say to measure headspace each time. Though I’d assume this is just to make sure the dimensions of the barloc haven’t changed from repeated mounting. I’m theory and perfect world, I’d think it should work without headspace gauge. Of course for a savage or remade style prefit, you will always need headspace gauge no matter what.
 
#22
I recently quit pulling the barreled action to swap barrels. I pull the scope just because I think the action could possibly twist a little and it's only two nuts.
 
#23
Savage small shank barrel threads are 20 tpi which means you have about a 30° window for headspace (assuming 0.004" between GO and NO-GO).

It's pretty easy to eyeball 5° or less and probably impossible to thread a turn too far or tighten up a turn too soon so if you loktite your Barloc barrel nut and pay attention, you probably don't need headspace gauges after you headspace it the first time.

Of course you should understand that you are trying to make it impossible to time up at +360°, +180°, -180° or -360°, confirm your work and check headspace whenever possible when you switch barrels.

It's not quite as simple as tightening a shoulder against an action face but it's a lot less likely to loosen while shooting.
 
#24
So five times you've paid a gunsmith to custom chamber, thread, shoulder and flat a barrel for you?

That's some complexity and a bunch of cost too.

The Barloc is essentially a miniaturized and somewhat improved version of a jack screw. It's old technology that is used a lot but just on things mostly too big for hand tools. Everything a multi-bolt jack screw is good at a Barloc is good at too but the toroidal geometry automatically compensated for misalignment in the action face, barrel nut or shoulder and it tightens without rotation so you don't have to worry about clocking (if you have accurate witness marks), frictional thread wear or variation in applied torque (within reason).

That complexity is a fixed cost and it's pretty robust. I'm not worried about breaking a Barloc.

It's a trade-off, I'm going for Barloc because it is going to be cheaper right away, cheaper to add barrels, gives me the benefits mentioned above and will let me do barrel changes with hand tools.
 
#25
flyer said:
So five times you've paid a gunsmith to custom chamber, thread, shoulder and flat a barrel for you?

That's some complexity and a bunch of cost too.

The Barloc is essentially a miniaturized and somewhat improved version of a jack screw. It's old technology that is used a lot but just on things mostly too big for hand tools. Everything a multi-bolt jack screw is good at a Barloc is good at too but the toroidal geometry automatically compensated for misalignment in the action face, barrel nut or shoulder and it tightens without rotation so you don't have to worry about clocking (if you have accurate witness marks), frictional thread wear or variation in applied torque (within reason).

That complexity is a fixed cost and it's pretty robust. I'm not worried about breaking a Barloc.

It's a trade-off, I'm going for Barloc because it is going to be cheaper right away, cheaper to add barrels, gives me the benefits mentioned above and will let me do barrel changes with hand tools.
Click to expand...

You are still paying for chambering and threading regardless of the setup. You have to have go/no go on savage style prefits even if you only use them once as you're saying. In his case that's 5 sets unless he's running 308, 260 and 243 barrels that all use the same gauge. It's a wash regardless of how you look at it unless you have to send your action off every time. I like the KISS method personally, action wrench and barrel vise are a one time purchase and it's not difficult to do. It's not time consuming either lol.
 
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#28
Maybe I'm not terribly picky about the barrel profile but I seem to find close enough to what I'm looking for pretty much off the shelf or a regular catalog item.

If I'm in a real hurry to get an oddball, I guess I could find a barrel blank in the right profile (or as close as I can get) and then find a gunsmith that can chamber it and thread the ends.

I am waiting on my action so no, I don't have it yet. I wish I could have it on my schedule but I'm just waiting with my parts.

Have you got your hands on a Barloc? If not ARC has a nice video on their Facebook page showing how it works.

I have screwed shouldered barrels on to actions so I know how that works and the pain in the ass it can be when everything isn't perfect.
 
#31
winniedonkey said:
No closer to which way to go. I wonder which will have the staying power. Somebody with 20k to burn rig up a test between the flats, switchlug, and barloc.
Click to expand...

Probably nobody can shoot the difference. Plus and minus all around, the only one I'm not too keen on is the switch lug for having to drill holes in the action face.

Between flats and the Barloc, I'd expect the shouldered barrel with flats to be a little more repeatable for POA/POI, but will be less forgiving in terms of headspace. Smith has a .004" window (ideally .002"), where the Barloc can be stretched open a little by torquing the barrel on before tightening the screw, or it can grow lengthwise by ~0.010" or a little more to accomodate a much wider window of shoulder positions while maintaining proper headspace.
 
#32
If context is what you want, a barrel is essentially a threaded fastener and I've been studying, designing and specifying high performance threaded fasteners on and off for about 26 years.

The funny thing about decades of experience is that you can use examples from the past to accurately predict the behavior of things that you have only seen.

I have installed shouldered barrels so we're even except for maybe that 26 years of high performance fastener work.

And yes, I have three Barlocs on order. I'm confident that it will do exactly what I think it will and what it's advertised to do so I put money on it.
 
#33
I've fixed a few FALs with barrel timing issues. That's kind of hard seeing as how the timing effects both the POI and POA (barrel mounted front sight).

In the process I had to take the barrel off and put it back on a few times, each time noting the POI. Usually it's a combination of poor timing and out of square shoulders.

Of course headspace in a FAL is set a different way but after timing it up, the headspace change was so small that the original locking shoulder was fine.

I've screwed other barrels on to other rifles but never specifically for a switch barrel. Years ago I had a little Browning .22 takedown, it seemed to return to zero pretty good, I think it had a type of threaded adjusting nut, I didn't own it very long.

I've had relevant experience if you only count guns as relevant. I've had plenty more in non gun stuff that uses fasteners in a similar way.

I'm sorry to have to turn this around on you but did you go to your gunsmith and tell him how to do a switch barrel setup or did you ask for a switch barrel and this is what you got?
 
#36
flyer said:
I've fixed a few FALs with barrel timing issues. That's kind of hard seeing as how the timing effects both the POI and POA (barrel mounted front sight).

In the process I had to take the barrel off and put it back on a few times, each time noting the POI. Usually it's a combination of poor timing and out of square shoulders.

Of course headspace in a FAL is set a different way but after timing it up, the headspace change was so small that the original locking shoulder was fine.

I've screwed other barrels on to other rifles but never specifically for a switch barrel. Years ago I had a little Browning .22 takedown, it seemed to return to zero pretty good, I think it had a type of threaded adjusting nut, I didn't own it very long.

I've had relevant experience if you only count guns as relevant. I've had plenty more in non gun stuff that uses fasteners in a similar way.

I'm sorry to have to turn this around on you but did you go to your gunsmith and tell him how to do a switch barrel setup or did you ask for a switch barrel and this is what you got?
Click to expand...

Lol about the browning takedown rifle. The front and rear sight are mounted on the barrel so I would hope it has repeatability
 
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#37
Bradu said:
Lol about the browning takedown rifle. The front and rear sight are mounted on the barrel so I would hope it has repeatability
Click to expand...
I have one of those too. They are a fun little rifle to shoot and are great for casual shooting of shooting trees against a friend.

As to a switch barrel set up, I had discussed this with my smith and he recommends a shouldered barrel set up. Reading through this thread, ruebinski's thread and elsewhere, I'm going for the flats and torque wrench with crow's foot method. Different strokes and all.
 
#39
Just ordered a pair of Bighorn TL3 223 trainer barrels from Keystone Accuracy, one for me and one for a friend. Full shouldered barrels, don't need to send him my action. Sounds like leads times will be very short as well, since he does the barrel contouring in house and doesn't need to wait for a certain blank to come in.

Went back and forth deciding between a button rifled blank $379 all-in chambered and threaded muzzle or a Krieger at $599 all-in. Decided on the Krieger since both were such a reasonable cost. I penciled out the math and it's only about a 2.5 cents per shot difference or $180/year if I'm shooting 7500 rounds/year.

Have heard good things about Keystone's work, excited to see how they shoot.
 
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#40
Sheldon N said:
Just ordered a pair of Bighorn TL3 223 trainer barrels from Keystone Accuracy, one for me and one for a friend. Full shouldered barrels, don't need to send him my action. Sounds like leads times will be very short as well, since he does the barrel contouring in house and doesn't need to wait for a certain blank to come in.

Went back and forth deciding between a button rifled blank $379 all-in chambered and threaded muzzle or a Krieger at $599 all-in. Decided on the Krieger since both were such a reasonable cost. I penciled out the math and it's only about a 2.5 cents per shot difference or $180/year if I'm shooting 7500 rounds/year.

Have heard good things about Keystone's work, excited to see how they shoot.
Click to expand...

I had never heard of them before. I went and looked them up and they support Sky High for Saint Jude. The wife and I have volunteered at some of their skeet shoots and it is an excellent cause. Keystone Accuracy will certainly have my business.
 
#41
I've got two keystone barrels now. John does great work. His turn around time is incredible. I ordered a button rifled trainer barrel at 2pm one afternoon and had a shipping notification the next morning when I woke up. Mind you the barrels are not pre manufactured.

I will only buy shouldered as it is just too simple to install one. I have one kreiger and just got the button. Really looking forward to trying it out!
 
#42
Bradu said:
Lol about the browning takedown rifle. The front and rear sight are mounted on the barrel so I would hope it has repeatability
Click to expand...
I forgot about that part, like I said, I didn't have it long.

I guess I'll be in the minority with my Barloc until I can get it together and document it's return to zero performance.

I think I'll cook up some good tests to determine how much curve my barrels have and how much barrel timing will effect POI at range although I will probably only have 100 yards available to me for testing initially.
 
#43
Yeah the rings of the BarLoc have a flat face that shoulder up against the barrel and action. The opposing side, that faces the BarLoc, is conical, so as you apply torque they expand putting the system in tension. It is a compounding effect as only 90in-lbs on the BarLoc will require greater than 90in-lbs with an action wrench to get the action off.

I gusss I could try lower torque settings and see if the repeatability improves.

I really like the ease of the system. It literally takes longer to change the bolt face or load up a .223 mag than to change the barrel.

Like I said previously those results were only over three range trips in which quanlifying the BarLoc was not really the objective of the day. I’ll update the review when I have more data.
 
#46
I think your return to zero variation was caused by barrel timing, not torque differences.

A dirty bolt face or chamber might cause a 5-10° difference in timing if you're using only a headspace gauge for installation which is why I want to use witness marks and/or a timing jig to get timing the same every time.
 
#47
flyer said:
I think your return to zero variation was caused by barrel timing, not torque differences.

A dirty bolt face or chamber might cause a 5-10° difference in timing if you're using only a headspace gauge for installation which is why I want to use witness marks and/or a timing jig to get timing the same every time.
Click to expand...

I am using witness marks on both sides of the barrel referencing the chassis. See below link for setup and review

ARC Shouldered BarLoc review
 
#48
I got +/- 0.2 mil or so for rtz with my shouldered Barloc setup using witness marks. I plan to get a small torque wrench and test it further later this summer. I was just going hand tight with a 4mm hex screwdriver attachment.

Barrel nut version of the barloc was much pickier. From almost nothing to 2 mils depending on where the nut clocked.
 
#49
Ledzep said:
I got +/- 0.2 mil or so for rtz with my shouldered Barloc setup using witness marks. I plan to get a small torque wrench and test it further later this summer. I was just going hand tight with a 4mm hex screwdriver attachment.

Barrel nut version of the barloc was much pickier. From almost nothing to 2 mils depending on where the nut clocked.
Click to expand...

What are you using for your witness marks? I am using a paint pen, so there is certainly some uncertainty in that. I am using a craftman torque wrench, so I am surprised your results are better just using the hand tight method. What calibers?
 
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