I have used quite a number of different ones, but, my mainstay since I started loading in January, 1968, has been the CCI 250. As to accuracy, my spare pair of almost un-fired P-64 Mod. 70s in .338WM will and does shoot 1/2" and smaller groups with 250 NPs over 76-RE-22 using this primer, my Dakota 76-.338WM will do the same with 77 grs.

Sooooo, I see no major reason to change as most of my big game rifles will do under a m.o.a. with NPs and CCI 250s. I do not like Federal primers as well as they are "soft"and tend to show what many consider excess pressure signs long before a load reaches acceptable velocities.

My pair of P-64 Mod. 70 Fwt-.270s will do 2900 fps with Re-22 and 150 NPs; the Fed. 215s get flattened and the CCI 250s look just fine....and there is NOT enough pressure difference here to account for this, "know-it-all" gunwriter magazine bullschitt notwithstanding.

For hotter loads, the Winchester mag. primer has the "rep." of being the highest brissance available, but, this would only really benefit one in the Arctic or maybe shooting a .338 Lapua and one try with one of thoise wa enough for me.