I'd guess it is. A magnum primer just throws a larger flame to efficiently ignite the larger mass of powder. I'm not going to do a search like carnold did. I'm waiting to hear what the next poster says...
Posts: 16534 | Location: Between my computer and the head... | Registered: 03 March 2008
Originally posted by ramrod340: There is no problem swapping std for Mag. However I WOULD NOT do it without backing up on the charge and working back up.
Agreed.....but every time I've done it, I wind up at the same place as I was formerly..... That said.....I'd never just switch them!!!!!especially when loading "Max"
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Posts: 28849 | Location: western Nebraska | Registered: 27 May 2003
all I use is Fed GM215M in my 22-250 along with 38.0grs of H-380 (what a boring ass load) never backed off just switched primers and loaded groups shrunk 3/4" with switch.
Posts: 450 | Location: CA. | Registered: 15 May 2006
There is a slight size difference with the 2 large size primers, one is taller. The small rifle/pistol is the same size. I have used a few sp mag primers in lower charged 204 Ruger loads without any problems. YMMV
O.K.. I skimmed the title & though we were comparing LR to LP.
NRA(Life),Veteran, RMEF,RGS,DU
Posts: 49 | Location: WI | Registered: 31 January 2010
I have 1000 Fed LR mag primers and use them in my 45/70 rather than using my LR,but I don't load "hot"-450grLFN at 1350,so no problems and seem to group the same.
Conversely, when I began working up loads for my 7mm Mag, I only had Large Rifle primers on hand. I found a load that was accurate, and kept using the same primers ever since, and that's been 20 years ago. No problem with the loads in cold weather either.
