Monterey21
Well-Known Member
Morning all, I'm reaching out to the experience of the group. Have a new project that I have been working on for a few months. 6.5X284, SR3 long action, AG Composites, B&A trigger, and Preferred Barrel Blanks pre-fit with Zermatt /Savage nut. Their #4 contour. The issue is from cold bore the velocity increases for 3 or 4 shots until heat gets in the barrel then the velocity stabilizes at about 10FPS ES or less. point of impact changes, gets higher@ 100yds, with the first two rounds then is 1/2 MOA or so. Depending on me. The load is 53.5 4831SC with 140 Berger Elite hunter and a CCI match primer .010 off the lands. Same everything with 57.0 N565 is a little faster.
the question is why does it get faster with heat? I understand the bore can get tighter, bullet gets tighter, better seal in theory.
the question is why does it get faster with heat? I understand the bore can get tighter, bullet gets tighter, better seal in theory.