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Barrel Length Impact on My Reloading

pccraig

Private
Minuteman
Sep 30, 2008
1
0
Service rifle competition.

For the past few years I've been shooting SR competition with a standard Colt HBar A2 with a 20" 1:7 barrel and iron sights.

My go to load included a Nosler CC 77g bullet.

I've recently completed a new build. A 16" M4 style rifle with a mid-length gas system and a 1:9 twist with the Hi-lux 1-4.5 optic.

Now I'm wondering with the shorter barrel and "lighter" twist, should I downsize the projectile.

Any insights would be appreciated.

Thanks