Money is a flat rifle waiting for a third dimension
EXCELLENT!! I think I'll have that engraved on my tombstone <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
I did a test one time with an accurate (it'll average in the 0.300's) 308 700 VSSF using 748 powder and F210M (standard match primer) and F215M (magnum match primer), with 168 MatchKings. Minor difference in average group size, favoring the standard primer. Then I tried the same thing with AA4064, and, the magnum primers won. The tests were four, 5 shot groups, with the targets fired round-robin, so, no particular combo had an advantage.
Then, using H450, a Spherical powder with a reputation for being a hard starter, in a 284 Win., I tried identical loads using WLR's and R9-1/2M's; velocity with the WLR's was noteably (minimum 50 FPS average) higher than the magnum, but, the R9-1/2M's grouped better.
In a 7RMag using a max load (71 grains if the old gray matter hasn't failed me) of H1000 with 162 Hornady's, CCI250's grouped better than WLR's and R9-1/2M's, but the WLR's led in velocity again.
<img src="/ubbthreads/images/graemlins/confused.gif" alt="" />
I did try Mule Deer's tip (I think it was yours) in a recent article about using magnum primers with TAC in a 223, which really tightened up some of the groups.
So, now I'm using magnum primers in a little case, and standard primers in large cases.
R-WEST