Rifle Scopes Will this scope and rings work?

[tacit blue]

Hello,

This is my first post on snipers hide so bare with me!

I have a SPS Tactical in .308 and i'm just about ready to purchase all my stuff here. Before i do that, i wanted to make sure that i correctly selected the correct rings for my rifle.

I'm using a Millet TRS-1 scope with a 50mm objective and i plan on using TPS low rings with a height of .925 and the TPS XP base. Which is a estimated height of .350. I used the data from the EGW one. I wasn't able to find the exact specs on the TPS XP. I took a look at the ' sticky' for the ring height selection. So far my math came out to 16.275, which gives me 16mm of space between the barrel and the scope? Thats if i did the math correctly lol. I followed this formula:

" [rail height + ring height] - [bell diameter x 0.5]
If the value is positive, then your bell will clear the barrel. Optimally, you want that bell to be about 1/4" or less over the barrel. This will give you a tight cheek weld and provide for more precise trajectory. Be sure to account for Butler Creek caps if you intend on using them."

It also mentions to measure the base height from the barrel, obviously that wont be possible as i don't have that nor the rings.

Sorry for the overly technical post here

 

[WhiteDingo]

Re: Will this scope and rings work?

Did you make sure to do all your math with the same units?
Just punching your numbers gives me nothing anywhere near 16

50mm is 1.968 inches.

 

[tacit blue]

Re: Will this scope and rings work?

i feared this would happen, lol. I was hoping it would be easier than this to see if it would work.

 

[WhiteDingo]

Re: Will this scope and rings work?

Well, it is easy. Let's just put all your numbers here and see what happens.

<span style="text-decoration: line-through">We've determined that 50mm is 1.968 inches.
So:
(.925 + .350) - .984 = X
1.275 - .984 = X
.291 = X
Given your numbers, the scope will clear.</span>

EDIT: What ToddKS said is correct. Brain fart about the objective bell vs lens size. Sorry, long day.

 

[ToddKS]

Re: Will this scope and rings work?

This combination is not going to work.

Keep in mind that the diameter in question is the outside diameter of the bell, not the objective diameter.

I would expect that the outside dimeter on that scope is in the neighborhood of 2.8 inches (62mm).

Ring height to center = .925
Base height = .350
Total = 1.275

.5 X 2.8 = 1.4

1.4 is greater than 1.275 so this combination is a no go. Even if the ouside diameter is 60mm (2.7 inches) you are still no go.

I have mounted 50mm objective scopes in both Seekins and Burris XTR Med rings and it has worked. I would go with medium rings. The barrel taper will give you some slack on that equation.

 

[tacit blue]

Re: Will this scope and rings work?

Will i have to install a adjustable cheek weld? in order to compensate for the height difference? Or would i be good to go with the houge over molded stock? The mediums rings are 1.075 in height.

Ok, kinda of confused Midway has this to say about the TRS-1.

Technical Information

Tube Diameter: 30mm
Objective Bell Diameter: 59.8mm
Ocular Bell Diameter: 40mm

Adjustment Click Value: 1/4 MOA
Eye Relief: 3.5"
Exit Pupil Diameter: 3.5-12.5 mm

Millet has this to say


* Magnification: 4-16x
* Objective Diameter: 50mm
* Eye Relief 3.5"
* Tube Diameter: 30mm
* Optics: Multi-Coated
* Reticle: Illuminated Mil-DotBar

looks like Mid-way has done more research than Millet lol.

Thanks again guys, great useful information here.

 

[ToddKS]

Re: Will this scope and rings work?

You will quite possibly need some sort of cheek piece or stock pack to get a proper cheek weld. An adjustable cheek piece is nice, but there are other options available to solve the problem.

The cheek piece below is also an option. I am leaning this direction myself as the price is right.

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2227118#Post2227118

The group buy fell through, but I believe you can still order direct from XLR.

 

[Heronion]

Re: Will this scope and rings work?

I'm pretty sure TPS measure their rings to the CENTRE of the tube. Double-check, but I'm fairly positive. So if you're running a 30mm object, then the .9--" rings are more like .4" rings (from base to bottom of "hole." So make sure you're on with the measurements and locations.

 

[tacit blue]

Re: Will this scope and rings work?

yeah i think i'm just going to go with mediums see how that works.

 

[Glen Seekins]

Re: Will this scope and rings work?

Our lows will clear but mediums would allow you to move the scope around a bit more and get your flip up cover on easy. No cheek weld issues. If you wanted you can do a stock pack and be good to go

 

[z71rat]

Re: Will this scope and rings work?

Go with the Seekins. Superb quality and craftsmanship. I have my set riding proudly on my 10PC!!

DK

 

[AK10mm]

Re: Will this scope and rings work?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: z71rat</div><div class="ubbcode-body">Go with the Seekins. Superb quality and craftsmanship. I have my set riding proudly on my 10PC!!

DK </div></div>

I was a Steel Rings only guy till I started using Seekins,never have looked back........

 

[lennyo3034]

Re: Will this scope and rings work?

Go with the Lows or Super lows. I run a TPS base with TPS Super-Low Steel rings and I get plenty of clearance even with butler creeks on a Sightron SIII 6-24X50. Go with the Lows if you want to be on the safe side, but DO NOT get mediums, they will be too high.

 

[tacit blue]

Re: Will this scope and rings work?

<span style="text-decoration: line-through">I just got off the phone with SWFA and they told me with the 20 MOA Base and my .925 low rings the 50mm object should clear.Maybe they did not take into account the ' Bell Diameter' which is 59.8 Not sure how they did their calculations here, i'm getting confused. </span>

Midway tells me to get Mediums too, one of the reps did the calculations on the phone.


Toddks says to get mediums,and everyone else is telling me low's should be fine.? So a 50/50 mixed response

 

[kombar]

Re: Will this scope and rings work?

If you have everything but the rings in hand, you can skip the calculations and just use feeler gauges between the base and scope to see where the different height rings will put it. If you also don't have the base, just add that estimated .350" to the feeler gauge stack.

TPS lows should be .335" from base to tube, so you can use a stack of .335" if you have the base on the rifle, or one of .685" if you don't.

 

[lennyo3034]

Re: Will this scope and rings work?

My rifle is a 700sps with a varmit contour barrel. I am using TPS super-low steel rings on a TPS rail. The scope is a 6-24x50 Sightron SIII. Here are a few pictures of the clearance with and without butler creeks:

Here is a larger picture of the setup.

The sightron has a smaller OD than most 50mm scopes but not by much. Your TRS-1 is 2mm wider, meaning it's 1mm lower. Midway lists the TRS-1 as 16.4" long, which is longer than the sightron, meaning you shouldn't run into any issues do to the contour of the barrel. Of course, the shape of the scope has a lot to do with that too. I would say the TPS super-lows would work although would be very tight. I would recommend the TPS lows and am so sure that it would work that if it doesn't, I will send you my TPS mediums for free.

By the way, welcome to the hide.

 

[tacit blue]

Re: Will this scope and rings work?

Thanks for the Welcome Lenny!


I guess sometimes all it takes is a physical comparison to make a judgment on. If your able to get away with it, i should be able to.

The Sightron has a object bell diameter of 57.9mm and the TRS-1 59.8 mm. So the difference is 1.03mm. I don't see why it wouldn't work, any event thanks for the offer for the mediums if it doesn't work out

I'm sure i wont have that issue.

Thanks, to all for the help!

 

[z71rat]

Re: Will this scope and rings work?

Glen Seekins, as in the Seekins part of Seekins Precision... tells you that his "lows will work", but mediums will "provide more room for the Butler Creeks".

If Glen says it will... and those of us that have his rings say it will... then it will. Unless you decide to use the mediums, then you won't have to worry about anything. Except the scope sitting possibly TOO HIGH. Your call Bro.

DK

 

[z71rat]

Re: Will this scope and rings work?

I'm sorry... that sounded like I was being kinda pissy. Didn't mean for it to come across that way. But I do believe the lows from Seekins will work. I have quite a bit of room available on my 42MM Super Sniper, even with the Butler Creek covers.

I believe that it will fit. It will be close though, but should still fit.

DK

 

[tacit blue]

Re: Will this scope and rings work?

Thanks for the apology. Wish i could afford Seekins rings, but at this point with Mothers Day and her Birthday around the corner, think i'm just going to go with TPS for awhile.

Then Seekins will be my next choice for an upgrade.

On another note the Seekins lows specs are 30mm 0.82". Whereas the TPS were a tad bit higher at .925 so.. I think TPS will Low's give me that slight height advantage. Assuming the fact that they are measured the same way.

Anyways, no worries. I'm not upset that you got all pissy, it was kinda of amusing when i read it.

I got tough skin.

I think after having the experience of 3 Drill instructors yelling in your face, nothing seems to get you upset easily anymore lol.