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Gas Gun Groups Thread

I recently replaced the original barrel on my JP LRP-07 6.5 CM after shooting it out with a Bartlein 400modbb from Craddock. I did load development on it with my recently replaced Surefire RC2, my 1st group was always the best and they would gradually open up. When I say open up my "average 5x5 was around .8 MOA plus or minus.

I've been wanting to try one of the Chad tuner brakes and they came in stock, and I had one delivered. Last week I shot about 60 rounds through it testing the 1st 12 tuner settings and a few showed promise. I shot the attached targets from left to right and top to bottom, the 2 top groups were different tuner settings and the last 5 were all on the same setting that showed promise previously. These are all 5 shot groups using Lapua SRP brass, H-4350 and Berger 130 OTM's. I did make a scope adjustment from group 3 to 4 and was adjusting my gas settings on the last 3 groups which I have to believe was affecting my POA.

Tuner Test - Final Setting +3.jpg
 
From my 18" KAC LPR Mod 2 between 08/2020 to 05/2025

18" KAC LPR Mod 2
BulletRoundsGroupsAvg MOAPowders
Sierra 77gr SMK
552​
109​
0.93​
AA2250, Shooters World Precision Rifle, H322
Nosler 77gr HPBT CC
188​
41​
1.095​
AA2230-C, CFE223, H322
Hornady 73gr ELDM
116​
21​
1.216​
AA2230-C, H322, AA2520
Hornady 68gr BTHP
50​
9​
1.207​
Shooters World Precision Rifle, H322
Hornady 55gr VMAX
10​
1​
0.86​
H322
Hornady 55gr FMJ
5​
1​
0.86​
AA2460
Factory Seconds 55gr BTHP
5​
1​
0.86​
AA2460
IMI 55gr FMJ M193
15​
2​
2.725​
Factory
Wolf Steel 55gr FMJ
3​
1​
0.75​
Factory
Federal 55gr FMJ
10​
1​
2.43​
Factory
Federal 50gr JHP
10​
1​
1.88​
Factory
Hornady 50gr VMAX
10​
1​
1.27​
H322
Hornady 40gr VMAX
10​
1​
0.85​
H322
984​
190​
1.038​


If anybody has any specific questions about any projectiles or powder combos, I'd be happy to share my experiences with it and some groups.
 
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