I am currently on the high end of pressures on my 7mm Mag. I know that if I go much higher on my IMR4350 the bolt gets sticky. I load 60.5 grains for a 160ab and shoot 2,950 on average with little variance. If I go to 60.7 my velocities jump to 3,000 and the bolt gets a fairly sticky (but no blown primers or anything like that).
I was wondering since I am on the higher end of pressures if it effects my barrel life and how many shots should I expect before the barrel needs to be replaced? After my first 400 or so rounds my chamber length went from 3.360 to 3.386. Is that throat erosion normal or excessive possibly from pressure?
Thanks
I was wondering since I am on the higher end of pressures if it effects my barrel life and how many shots should I expect before the barrel needs to be replaced? After my first 400 or so rounds my chamber length went from 3.360 to 3.386. Is that throat erosion normal or excessive possibly from pressure?
Thanks