I put 4100 rounds through my original model 12 barrel in 22-250 varmit contour. The groups had opened up to about 1" for 5 shots at 100 yards. Still worked pretty well in the prairie dog towns at shots up to about 200 yards. The lands had eroded forward about 3/4 of an inch. Originally, when new, I shot a few 5 shot groups at 100 yards that could be covered with a dime. I have abused this barrel and still feel like I got good value from it. On several trips I had the barrel so hot that it felt like a bee sting when you touched it.
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