04-06-2015, 09:57 PM
maverick5582 Wrote:With the 123 grain Nosler I used 27.0 grains of XBR for an average of 2382 f.p.s. With the 108 grain Lapua I used 28.3 grains of XBR for an average velocity of 2591 f.p.s. to 31.0 grains of XBR for an average of 2624 f.p.s. Nothing that I would consider a "hot" load. I have shot very few loads that indicated "excess" pressure. With the 123 grain Amax I used 29.9 grains of Lever Revolution for an an average of 2478 f.p.s.
You're about 2.2 grains higher than the Hodgdon's max load for the 107gr SMK, and the 108gr Scenar is longer than that one. There's your culprit if you do in fact have throat erosion. Pressures are probably in excess of 60,000psi easily.
What barrel length and bolt are you using? What barrel?
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com