Would some copper cleaner help?
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Would some copper cleaner help?
MUOTE=hkusp;1643476]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.[/QUOTE]
My LMT barrel lasted to about 13k rounds before it started keyholing past 200 yards. And thats with shooting 90% Russian bi metal jacketed ammo and plenty of mag dumps.
Id contact LMT and have them take a peek.
Man.. I have a couple of barrels with way higher round counts and throats so bad you can look into the chamber and see erosion... and they still shoot Hornady 55 FMJs good. :confused:
Thank you. I mearly meant to add some validity to what seemed a perfectly logical answer. If he actually has this barrel checked over by an excellent gun/barrel smith, then I will become the wiser. I understand that barrels produced along the same line on the same day will often show different accuracy potential and wear characteristics.
Yeah... each barrel is its own animal... and the longer bullet idea makes sense to me. I just haven't seen it first hand.
I'd recommend pulling the flash hider off and cleaning all the carbon out of ii and cleaning the barrels crown. I'd also clean the bore with JB bore paste and then WipeOut-PatchOut copper remover along with their WipeOut-PatchOut accelerator.