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how much is acceptable chamber erosion

Re: how much is acceptable chamber erosion

Unless you are a competitive shooter and don't want it crap the bed on a match far from home, accuracy determines life. There is usually tale tale signs like unexplained fliers. Only one has just Quit all at once, and I could have missed the signs. I had a 6.5.x 284 that went 1200 rounds and started showing subtle fliers, sent it to Moon for set back and 2 inches were gone? I don't think there is a science .
 
Re: how much is acceptable chamber erosion

What Jon said.

I've seen precision 5.56 barrels shot out around 1200 rounds, while some have gone nearly 5,000.

What is your rifle for? If you're trying to put shots into small groups or targets far away you'll notice when your accuracy dies -- little things like wandering groups, unexplained groups with multiple centers, uncalled fliers, and needing increased elevation to make up for lower impacts.

Accuracy decline in chro-moly barrels is usually a long, slow process. Stainless barrels tend to die quickly. Bore-scoping is only a guide.
 
Re: how much is acceptable chamber erosion

Barrel erosion seems to affect accuracy depeding on how evenly the lands are eroding, some barrels continue to shoot well with lots of erosion, while others die with relativly little, usually those have one land eroded well beyond the others which causes the bullet to enter the rifling off center. Bore scoping is the only way to tell.