Since it can get "bitter COLD", here in Idaho, I'll stay with, LR Primers for my .243 Win Tikka w/ Rem Brass.
I do have one question tho,.. does anyone "KNOW" if, Magnum LRP's "tighten up" group's and SD's, in a 6mm/.243 class cart. ??
i use 40+ grains of IMR 4350 or, N-160 with, 80-90 grain Bullets,.. thought's ? Currently, my CCI 200's, produce .25-.5 MOA groups, w/ 80 Sierra #1515 and 87 V-Maxes, shooting the LOW accuracy "Node" in both loads. I do know that, using the F-215's over, a LR Winchester brand Mag Primer, "tightened up" my .270 WSM Groups, using 65 grains of IMR 7828 from just MOA, to about .5 to .6 MOA ( now getting, 1.25", Ctr. to Ctr. groups,.. at 200 Yards) for the 140 AccuBond.