This is pretty much the standard for bottle neck cartridges. Pushing a lot of heat through a small hole (overbore). It's a trade off, you shoot it till accuracy becomes unacceptable, re-barrel, and start the process over. I'm on my 4th 6mm barrel in 2 years shooting it in Practical Precision matches. I expect to change barrels between 1400-2000 every time. Accuracy standard is 1/2 MOA or better for match shooting. Beyond that it gets sold off at a deep discount or becomes a practice barrel.