Sub-MOA groupings with the Sako TRG M10 in .308 Win and .338LM

Eric B
by Eric B

Three holes in a paper at 100 meters. Some times these groupings come together, sometimes they don’t.

In a SAKO TRG M10, considering its price and all the premium components involved in this system, you would think that the groupings would always come together

We’ve tested the M10 with both the 308 Win and the 338 Lapua Magnum barrels. That’s a fine thing with the TRG M10, you can switch barrels.

For the 308 Win we used one of the least expensive factory ammunition on the market: GGG .308W ammunition, 147 Grain FMJ (7,62×51 NATO), from Lithuania. They supply to a lot of Armies in Europe, so don’t be fooled that a relatively low cost means low quality in this case.

Sako TRG M10 in .308 Winchester at 100 meters.
Definetly a sub MOA grouping. The tanned square stickers are 17×17 mm as a reference, so I’d say the group is about 10-12 mm. 5 shots of 308, but it looks like 3, from the owner of the rifle.

For the 338 Lapua Magnum we zeroed it at 100 meters, then took it to 300 meters immediately for groupings. Interestingly, the ballistic app iStrelok Pro worked flawlessly to foresee the right amount of clicks. The money we saved on ammunition is definitely worth the price of the app.

Below: The might 338 Lapua Magnum, from the hand to a target 300 meters away.

Kahles K624i sight, one of the best scopes on the market in a Spuhr mount.

Below: Three Three Three Eight Lapua Magnums (now repeat that fast ten times, good luck).

These were shot at 300 meters, and sub-MOA. The recoil was relatively mild, but don’t have your nose too close to the scope if you’re not holding the rifle tight. Only 3 shots on this picture, but this performance was repeatable. I guess the factor which adds the most uncertainty is the shooter, not the system or the factory load.

Tikka T3x TAC A1 left (not in the test) and SAKO TRG M10 right.

Eric B
Eric B

Ex-Arctic Ranger. Competitive practical shooter and hunter with a European focus. Always ready to increase my collection of modern semi-automatics, optics, thermals and suppressors. TCCC Certified. Occasionaly seen in a 6x6 Bug Out Vehicle, always with a big smile.

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  • Wolfgar Wolfgar on Dec 05, 2017

    We use 5 shot groupings where I live. I purchased a used factory Remington 700 varmint rifle many years ago that can shoot 1/2", five shot groups at 100 yds. I have to use Fed match ammo for this type of accuracy and have not been able to duplicate it with my hand loads. The secret to match ammo is consistency. If a person had only one cartridge of crap ammo but could clone that one piece of crap ammo repeatably, they would have the worlds best match ammo.

    • See 11 previous
    • Goody Goody on Dec 08, 2017

      @Wolfgar "How would barrel harmonics change from cloned cartridges?"
      Since you asked, see above.

      I don't think you do know about variables effecting accuracy. Otherwise you would know that most rifles have definite preferences for seating depth and velocity/charge weight. To deliberately avoid these preferences with 'clone ammo' will result in accuracy below that rifle's standard. I know my 308 likes 46.3gr of AR2208 with 155gr Hornadys. With trued cases and batched br primers, on a still day, this load will shoot 0.3" tops at 100m. This is a medium/warm load in my rifle - the case is fairly full so there are no powder voids. As I ran through the rest of my loads that day, I think I got as far as 47.5gr of powder - a compressed load. It was still a cool autumn day, the gun was still cool, I was still using the same batched cases & primers, but my equal quality ammo threw groups over an inch. I was feeding the rifle what I didn't like.

      So if you take 'bad' ammo (that does not suit the rifle's preferences) and reproduce it exactly, you might manage to make good ammo for someone else's rifle, but it will never group in yours.

  • Tom Tom on Dec 07, 2017

    I would hope they shoot amazing groups, it's a $11k rifle. Rifles can also be tuned to particular ammo, there are several companies that "tune" a rifle with chamber/harmonics etc. for example to work with the Federal Gold Medal Match .308 rounds. I wouldn't be surprised if some of these high $ military issue weapons like the TRG/AI etc. are doing a lot of testing to get the most out of the gun with various military loads, not highly modified AOL etc. handloads.

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