A few questions regarding the load. Given that each rifle is different - your mileage may vary. But I thought I'd post it here for reference (see also the existing 6BRAI node
thread):
Powder: 30.40gr H4895
Primer: CCI450
Bullet: 103 Vapor Trail
Bullet Seating: Jammed .018
Average Speed: 2970
A side note about load development. I only have local access to a 300 yard range. I tested various seating depths on separate days at my local range.
30.4gr. 4 shot groups @ 300 yards. Center circle is 1 inch (IBS 200yd hunter rifle targets).
Based on this, I figured it would be +.015, +.003 or -.003.
A week before the match, Rich (
@Jet) invites us (
@knguyen and myself) down to his range (it's a long 1.5 hour drive for me) to try out our loads at 550 yards.
5 shot groups @ 550 yards (red target = 2 inch circle):

This is not what I expected for these seating depths given what was observed at 300 yards.
Compared the above seating depths to these (+.018 and +.009) 5 shot groups @ 550 yards:
Retest +.018 and +.009 (to see if I get consistent tight groups) with 3 shot groups @ 550 yards:
So decided to go with +.018 seating depth for the match. Fortunate we were able to test the loads at distance. Had I not done so, I would have picked a seating depth that would not have shot as well (as you can see from the 550 targets).
Don't know if this helps, but just wanted to share my experience. Again, your mileage may vary.
BTW: Congrats to Rich (
@Jet) for winning the NBRSA NW Regionals 600
and 1000 yard matches!!