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First 5 rounds grouped better than I thought they would..... only comparison was factory Alexander ammo.... I just figured my rifle was a 6-8" group (first low center target 10rns I think) shot at 100 yards.... I'm not claiming to be an ace shot at all. Still pretty novice.

it is a BCA 16" side charge 12.7/42mm.

Noticed a difference immediately getting 3" right off bat...eventually roughly a 2" group on one.... with lite powder loads.... MAX 47.5grn and MIN 35.5 grns...load data only 1-2 grns different from min-max. it likes the stuff between 35-38 depending on powder.... I shot H110–-LilGun—-1680...
I'm definitely going to try to tighten the up further. I didn't even adjust scope.

But couple questions:
1680 powder STANK...SMOKEY... and I think unburnt-(the most powder 45.5—47.5)... (picture of mag.....each 5 shots I kinda wiped clean)...also did I have a pocket of oil come from gun somewhere because my first 20 rounds (other powder didn't wet the bolt face or definitely not mag follower?

1680.... second photo right target shows one near center then following 4 shots grouped 8-10" low

Also.. I'm getting gouging on shell from what I believe to be barrel lugs...has to be. 2 marks on 90% of cases. Symmetrical about 10-2 o'clock. What's going on?
I'll leave it at that for now.... I had a great time and want to learn from this.

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Last Edited:
Same gouges happen on both my bca 12.7x42 I've tried lil gun for projectiles 350< and reloader 7 for anything bigger like the 400s I loaded so far just started useing 300-mp for the 350 grain solid brass spires
 

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