Originally Posted by
Zanshin
You are sending yourself on a wild goose chase trying to get better groups with 55 gr FMJ fodder. I believe that M193 is 2.5 moa ammo in the first place? Work up a load with some SMKs and watch that WOA barrel get better than 1 moa accuracy.
I save 55 gr FMJ to push down my chrome lined carbine barrel. I am under no illusions that I am going to get tight groups out of a 16 inch chrome lined M4 profile barrel. I shoot for combat accuracy, and for fun.
For my ARs with stainless match grade barrels I won't fire 55 gr FMJ from the barrel. I paid good money for a match grade barrel, and match barrels don't last forever like chrome lined barrels. You get (depending on the barrel) 2-4,000 rounds before it starts to lose some of its accuracy potential. With a match grade barrel I work up a load and then that's what i shoot from it.
By all means free float the barrel, but don't go looking for better groups from 55 gr FMJ just because the barrel is floated. Shoot better ammo.