
Originally Posted by
hkusp
I've put about 6500 rounds through my AR in the last three years. Barrel is LMT chrome-lined 14.5", 1/7 twist. It used to shoot 2-3MOA groups @100 yds with 55grn ammo, now rounds are scattering all over the place in about a 8" circle. After cleaning the gun I benched & rested it on sandbags yesterday, and with match grade 69grn ammo got sub-MOA groups. I tried the 55grn again and got flyers all over the place again.
So, is the barrel done & dusted or is there anything that can be done to make it work with lighter bullets? I've still got about 1K rounds of 55grn that I'd prefer to shoot rather than sell to get expensive match grade ammo.
It depends on a lot of things, to tell if its really smoked you need to have the head-space checked. That seams like a very large degradation in accuracy all at once and I think you should check your muzzle crown, if it became damaged during cleaning or whatever, its an easy fix to re do a crown. Also check out the entire weapon and your optic don't just assume its the barrel.
"After I shot myself, my training took over and I called my parents..." Texas Grebner
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