All things Steyr SBS-Pro Hunter

[357Max]

Yes. That’s how I was able to buy them.
The only other person with these new magazines is @357Max I wonder if he also called in to purchase the mags?

I Found an obscure FB post from 2018 with pictures, but no part#
Started dogging Einer Hoff @ Steyr last Jan 2020. He had their smith try them in a Manners & Mcmillan. I also spoke to V1 and they listed tham after shot last year. I got 2 of the first shipped to US.
https://v1tactical.com/product/10-round-mag-308-6-5c/
I did have to do a little work with a file for the Manners, but nothing major.

 

[Chiavettas_Yum!]

What did you have to modify?

 

[C_Does]

Those 10 round mags for the THB look Fantastic!

Does anyone know if the 5rd mags from the Scout will fit the THB?

 

[357Max]

What did you have to modify?

Well I could start a whole thread on this THB/Manners build, but for brevity I will say that once modified to sit properly in the v block of the chassis (lowered) it had a snow ball effect.

I contemplated doing a build thread but figured since it's a very limited production Steyr no one would give a shit.

YMMV, but on mine since it's lowered the top of the mag hit the bottom of the action before the locking clasps would engage the chassis.
My solution was to split the difference i.e.

1. Clearance the top of the mags to allow them to raise a little higher.
2. Radius the sharp corners on the locking hooks to match the radius of receiver slots in mini chassis, thus allowing them to positively engage sooner/lower.

I have 2 of these modified the exact same way & both have been 100% reliable. They can be inserted hastily without squeezing the side tabs. I love these mags & they have ruined me for AICS mags.

 

[357Max]

Out of curiosity; is anyone else on this thread signed up for the 3 times cancelled Steyr SPR-1 training at the Steyr academy?

This was free if you purchased a THB during 2019 - early 2020

I got an email from Eduardo. He's stuck in Spain due to covid travel restriction BS. He said that we would receive training materials this week & basically we will be covering most of the classroom portion online. Cool with me cause it'll likely result in more range time once we finally go live.

 

[chickon1]

Hell, I don't know which one requires an adaptor or not, the descriptions for these items suck!

This is the one I have been looking for. I'm not sure if it needs an adaptor or not. PN 2607050604

Steyr SBS Universal Thompson/Center Pro Hunter .243 Winchester/7mm-08 Remington/.308 Winchester 10 Round Magazine Up to 22% Off and Clearance w/ Free S&H — 3 models

Shop Steyr SBS Universal Thompson/Center Pro Hunter .243 Winchester/7mm-08 Remington/.308 Winchester 10 Round Magazine | Up to 22% Off 5 Star Rating on 1 Review for Steyr SBS Universal Thompson/Center Pro Hunter .243...

www.opticsplanet.com

 

[Sinned]

That one requires the adapter, I posted the part number for the magazine that dosen't need it on the first page. You'll have to call Steyr USA direct to order, these aren't listed on their website.

 

[357Max]

Hell, I don't know which one requires an adaptor or not, the descriptions for these items suck!

This is the one I have been looking for. I'm not sure if it needs an adaptor or not. PN 2607050604

Steyr SBS Universal Thompson/Center Pro Hunter .243 Winchester/7mm-08 Remington/.308 Winchester 10 Round Magazine Up to 22% Off and Clearance w/ Free S&H — 3 models

Shop Steyr SBS Universal Thompson/Center Pro Hunter .243 Winchester/7mm-08 Remington/.308 Winchester 10 Round Magazine | Up to 22% Off 5 Star Rating on 1 Review for Steyr SBS Universal Thompson/Center Pro Hunter .243...

www.opticsplanet.com

Yes that one needs the adapter.
If you want the mags without adapter it's in the link in my post #52 Edit: Order from V1 here @ $123 per.

Steyr 10 Round Mag 308 6.5C | V1 Tactical

v1tactical.com

If you want the mags below that require the adapter let me know. I have 2 plus the adapter kit. All new I'd be willing to sell you.

 

[chickon1]

Thanks 357.. Just ordered one..

 

[Chiavettas_Yum!]

Well I could start a whole thread on this THB/Manners build, but for brevity I will say that once modified to sit properly in the v block of the chassis (lowered) it had a snow ball effect.

I contemplated doing a build thread but figured since it's a very limited production Steyr no one would give a shit.

YMMV, but on mine since it's lowered the top of the mag hit the bottom of the action before the locking clasps would engage the chassis.
My solution was to split the difference i.e.

1. Clearance the top of the mags to allow them to raise a little higher.
2. Radius the sharp corners on the locking hooks to match the radius of receiver slots in mini chassis, thus allowing them to positively engage sooner/lower.

I have 2 of these modified the exact same way & both have been 100% reliable. They can be inserted hastily without squeezing the side tabs. I love these mags & they have ruined me for AICS mags.

View attachment 7576661View attachment 7576662

I pulled the action out of the stock and checked the alignment and fit to the mini chassis based on your information. I was concerned about the area you marked in my earlier picture and I took a good look at that area while dropping the action into the stock. If the action isn’t lowered directly into the mini chassis opening then the action bolt will contact the mini chassis thus marking the edges before dropping into its proper fit. I was able to get it to hang up but when shifting the gun it drops down on its own.

After giving it a thorough check, I’m feeling good that everything is good on fit and alignment of the action to the mini chassis. I even used calipers to measure the distance between the rear of the rail where it contacts the receiver to the receiver where it meets the top of the stock. If the action screw isn’t dropped down into place then the front rail measurement will not equal the rear measurement.

It’s pretty shitty that your rifle had these issues. After looking at my gun I can see how an inlet and mini chassis being ever so slightly misaligned could cause the problems you encountered.

 

[357Max]

Post 1 of 2. The issue.

I will make this issue/solution of my THB manners build in 2 posts.

All of the following information was given to Manners January 2020. They may have adjusted their programs as a result. So depending on manufacture date & or luck of the draw you may or may not have similar issues.

Steyr THB Manners in 6.5C. The barrel looked offset in the channel so I pulled the barreled action to investigate, install an area 419 Arca, & adjust trigger. The Steyr SBS action has a bolt on recoil lug & it looked like the flat on the horizontal plane, behind the lug was making contact with the flat on the mini chassis (shelf) before the V block contacts the sides of action near the front. When dry fit, & action screws snug there was side to side play at the front. Or in other words there was nothing centering the front of the action in the mini chassis. I verified this with some Dykem on the top of mini chassis shelf & dry fit. It's was just over 1/8" total side slip @ end of 25" barrel.

Here you can where the recoil lug shelf was touching the shelf in the mini chassis. Also notice at the bottom of pic, there is no indication that the action was contacting any of the 3 points it should be.

Here you can see if you look closely that the lug shelf was in contact with the mini chassis shelf. Shiny spots on shelf just behind the lug.

Shiny spot in barrel inlet is where barrel was contacting inlet.

I cut a relief in the barrel inlet with a sanding drum. Then laid 2 strips of plasti guage & refit the action.
For those unfamiliar, plasti guage is used to check clearance of engine bearings & the size I used will measure .0005 - ,0035 clearance. The clearance is determined by how wide the strip squishes out to.

It was completely smashed as in Zero or negative clearance.

I could see where the V block was in contact with the action just behind the rear action screw, however there is no sign that the v block has ever touched near the front of action.

Then it was time to break out the micrometers and get some exact measurements.

Stock/mini chassis

• recoil lug shelf down to low point of recoil lug recess = .3545
• recoil lug shelf to radius cradle (bottom action cradle) = .1345

Action/recoil lug

• horizontal flat shelf behind recoil lug - low point of lug = .327 (leaves about.028 clearance in chassis
• flat shelf to radius of action = .138 this = .0035 interference before touch down of radius bottom of action on mini chassis cradle.

The action should contact V block front and back with touch down at bottom radius of action front and back. This would be 6 points of contact.


I have a theory on how/why this happened.

I'm sure Manners either had one of Steyr's actions in hand or their print for the action + lug, however as you can see from the pictures, Steyr's bolt on recoil lug is a casting not a machined part. Since it's just a cast lug, that shelf dimension is not a critical dimension to Steyr. I suspect since the action interface of the cast lug is machined, the shelf depth has a pretty big allowable variation part to part, thus my issue. I'd be curious to know if they even bothered to spec a dimension range for the shelf depth?

Did I mention the cast bolt on recoil lug is ridiculously HARD!! I figured a quick fix would be to just chuck the lug in my mill and take a little off. That damn lug is so hard I couldn't cut it with a carbide end mill.

 

[357Max]

2 of 2 Solution

The best way I could think of to correct this was to dial it in level & mill about .006 off the whole mini chassis lug shelf (for reference the milled slot/step passing over action screw in picture is .024 deep).

To effectively bed this goofy recoil lug, it would require the bedding compound to be able to flow and bite into the shelf.
So I cut slots in the shelf for the bedding compound.
I also decided to extend the bedding out to include the entire forward portion of the action & first 3/8" of the barrel (smooth portion).
Rational for extending the bedding forward: I didn't really like that the action screw was so far in front of the chassis @ an unsupported location.

Ready for bedding.

Barreled action removed after bedding.
The lug was taped to provide clearance except for the bottom of the shelf and recoil face.
The barrel had 2 full wraps of electrical tape in front of the smooth portion & the groove between barrel and action was filled with clay. All bare metal parts were coated with release wax.

This is my first bedding job so it's not near as pretty as one done by LRI.
It is fully functional though.
The hammer forge imprint actually has .012 clearance to barrel and was just a place for excess bedding compound to escape.
The action is now supported all the way to the front including the first 3/8" of barrel.
As a bonus the front tapered face of the action forces the recoil lug back into solid contact when torquing the front action screw.
When bedding I torqued the action screws to 25 in lbs to ensure full contact was made with mini chassis.

It now contacts all 6 points of the chassis as it should have to begin with. Plus the additional support all the way to the front of the action.
As you can see the high spots on the mini chassis shelf milled .006 lower are still so close that they squeezed all the bedding compound out.

The bedding used was Pro Bed 2000. Single rifle kit. It's a very good kit that's only $16.00

This was a lot of effort on my part, but overall I'm really pleased with the rifle. It out shoots the test target that came with it.
Been able to print .5 moa both at 100 & 550 with Hornady 147 eldm or Prime 130 hybrids.

I've got the factory 2 stage trigger adjusted down to about 1.75 lb and Love it.

I do plan to change out the Arca rail for one of the weighted Area 419 rails so that it balances better on barricades. Shooting the Craft target drill revealed the need for better (forward) balance due to mid weight profile barrel.

Looking forward to doing some load development & see if it has a little room for improvement. I suspect it does.

 

[chickon1]

Good work! Looks like my bedding job.. the boyd's stock was even worse than that. I probably should have did what you did with the recoil lug. It is a pain to get out of the stock, but it comes out.