04-20-2021, 11:25 PM
SDW Wrote:Right. I came to that conclusion about the BRA extractor after reading Ballistic Advantage's specs. They are made of the same steel anyway. At $20/each I'll settle for no worse I suppose. I'll buy two of them. And as already said, pick up one of BFT's bolts ASAP.
I agree with you on the XBR load. Shots began behaving strange above a certain loading. Somewhere around 27.6 gr the bolt started to lock back partially. And brass path changed from the normal 4 o'clock direction to more of a 2-3 o'clock direction. And the groups began opening way up.
So, looking at my targets and fired brass this morning, I came to the conclusion that with XBR I would not go beyond 27.3 gr again. That group was a respectable .8", even if average velocity was only around 2390 FPS.
Of the four powders I was testing, I think I was most impressed by TAC. AA2520 didn't do so bad either.
That timing difference of where your brass is landing is telling you what the problem is and why you broke the extractor.
It's over gassing and trying to extract the case while its pressured to high to do so.
Call AA and see if they have an extractor or 2 instock. If they do, buy them, install and do something about the overgassing issue of your load and buffer setup.
Anything past 3 o'clock is overgassed.