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Sako TRG-S .338 Lapua Build

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Unread 12-14-2010, 11:01 PM
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Join Date: Jun 2004
Location: Texas
Posts: 1,075
Re: Sako TRG-S .338 Lapua Build

JRu, I've been able to examine a M-995 closely, but have never been able to examine a TRG-S.
from the pictures you posted, the similarity is obvious though. Yes the info is very helpful, and appreciated.

Thanks again, Tom
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Unread 01-17-2011, 11:07 AM
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Join Date: Jan 2005
Location: Wyoming
Posts: 215
Re: Sako TRG-S .338 Lapua Build

Originally Posted by Inkognito View Post
JRu: Thanks for some very helpful information. I'm sure the TRG trigger group would be very expensive if I could even find it. Since I am replacing the original stock I have to get new bottom metal anyway. I am wondering if it would be possible to get bottom metal that will take my TRG-S trigger group (as I am very pleased with it) but also take a TRG 42 magazine? Probably not, but I will explore that option.

I should back up and say that the only reason why I am contemplating this whole project in the first place is because the barrel that comes on a .338 Lapua TRG-S has a 1-12" twist. This limits me to shooting bullets no heavier that 250 gr. I thought maybe I could be content with that, but alas, I really want to try some heavier Barnes bullets like the 285 gr. So, I have to rebarrel and since I am going to rebarrel it only makes sense to go with a heavier barrel on something like this which means I also have to get a new stock that will allow for the thicker barrel. And while I'm at it I've been told by many people that it would be foolish not to upgrade the recoil lug that is, in many people's opinion, the weak link in the TRG-S design.

So, that is where I am at. The TRG magazine is just a rabbit I am chasing in this already complicated project. I probably should just go with the 26" barrel. No sense in doing all this and limiting the potential to save 3 inches in barrel length. Its not like this is going to be my concealed carry weapon or anything
Here's what I did:

Started off with the standard TRG-s in 338 LM. Put it in a McMillan A5 stock with bottom metal provided by McMillan. Magazine hardware from the original stock was transferred to the McMillan. Recoil lug in the original stock was transferred to the McMillan stock also, and a Badger Ordinance recoil lug was also added. The stock was pillar bedded and glass bedded with Marine Tex (thus the lug in the stock was enlarged to match the recess on the action and a recess was cut for the Badger Ordinance recoil lug). Effectively, the rifle is 'double recoil lugged'... not my choice, but very solid. GA Precicion did the work. The rifle was rebarrelled with a 27" Bartlein 5R in the Light Palma Contour (0.70" at the muzzle), 1:10 twist. The barrel was chambered by GA Precision and has a min spec chamber. A US Optics 20MOA rail was added... it fits the dovetails on the action, but was also drilled and tapped with four 8x40 screws and 'loc tighted' to the action. A Defensive Edge muzzle brake was installed. The original trigger is awsome, no changes made to that.

The factory magazine sucks, but I live with it. At the range I single feed. When hunting I use a rubber band to hold the bottom of the magazine flush with the bottom of the rifle or I use camo duck tape to hold it flush. This improves reliability but looks 'rinky-dinky'.

I get around 0.5" to 0.7" groups at 100 yards, with some smaller groups here and there. Holds sub MOA out to 810 yards (Furthest I've grouped it at) as long as the wind isn't too bad. I use 300 gr SMK's with 92 gr H1000 and Federal 215M primers. Jump the SMK's about 0.020". I get 2805 fps average with single digit ES and SD. FYI, that's a pretty stiff load.

I use a Redding Competiton neck sizer die with a 0.365 bushing. Bump the shoulder back 0.003" with the body die and seat with a Redding Competition Seater die.

By the way, the manual said the factory barrel was a 1:12 twist, but upon testing I found it to be a 1:10. Same result in my dads' TRG-s. He did something similar with his, but used a laminate stock and still has the factory barrel. His groups improved a lot with the change of stock and the bedding work.

PM me to get my number if you want to call and discuss this more.

Last edited by Rymart; 01-17-2011 at 11:15 AM.
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Unread 01-17-2011, 10:28 PM
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Join Date: Jul 2005
Location: Juneau, Alaska
Posts: 213
Re: Sako TRG-S .338 Lapua Build


Have you actually checked your twist? I know the manual says they are 1:12" but I found the same thing that Rymart pointed out...the actual rate of twist on mine is 1:10" and it stabilizes 300 gr. SMK's just fine.

"Fenced yards ain't hole cards and like as not never will be, reason for rhymers and old five and dimers like me."
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Unread 03-17-2011, 11:33 PM
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Join Date: Oct 2010
Posts: 25
Re: Sako TRG-S .338 Lapua Build

That's almost too good to be true. How would I test that?
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