04-05-2018, 07:17 PM
It really is but because it's so long it's tough to load consistently. Uniform neck tension is the hurdle I'm trying to get over now and on the next pass I may have that handled. Maybe AR-Comp isn't the right powder for these bullets because at an OCW node (26.7gr in my rifle) I have to firmly compress the charge and that interferes with seating the bullets to a uniform depth, but I believe I have some procedural changes to control that. Since I've got a new jug of AR-Comp I'm pretty much committed.
In today's session I had a number of 1-2 MOA groups
, but there were two groups that were cloverleafs
and I attribute the difference to neck tension and bullet seating consistency (SDs were not that good on most groups). I ran a span of seating depths and 1.613" (base to ogive) delivered the tightest groups, and in my rifle that puts the ogive .130" off the lands. Any longer and the rounds won't fit into the mag.
I had one round that lost the neck right at the top of the shoulder and after much searching and a bunch of guys looking into my chamber for themselves and not finding it, we decided that the neck must have gone downrange. It was such a clean and uniform break that I suspect that I cut too deep into the shoulder when I turned that neck, and it may have been the case that I used to set up my turning head.
In today's session I had a number of 1-2 MOA groups
, but there were two groups that were cloverleafs
and I attribute the difference to neck tension and bullet seating consistency (SDs were not that good on most groups). I ran a span of seating depths and 1.613" (base to ogive) delivered the tightest groups, and in my rifle that puts the ogive .130" off the lands. Any longer and the rounds won't fit into the mag.I had one round that lost the neck right at the top of the shoulder and after much searching and a bunch of guys looking into my chamber for themselves and not finding it, we decided that the neck must have gone downrange. It was such a clean and uniform break that I suspect that I cut too deep into the shoulder when I turned that neck, and it may have been the case that I used to set up my turning head.
I'll be yer Huckleberry.

