New to forum,been reloading for 20yrs,Dillon 550,RockC,old Lyman turret..Love reloading,lotta .45 and 7.62 Match rds,some weird calibers....Anyway,I have 900 Fed LR mag primers and I don't load anything that needs a mag primer...Could I drop powder by 2-3 grs in a 45/70(Marlin Guide Gun,I love big holes)and use the primers or find an even trade for LgR..

Are these 215m primers? If so i can trade or buy them from you.PM me with the details Chris

Sure, yo umay not even have to drop powder charge if you are well below max.

Actually, I've just been working up some loads for a 308 Win. handgun and tried Federal 215M primers among others. At least with the powders I tried, I didn't need to reduce the load with the 215M primers. In fact the best loads seem to be with CCI 250 (also a magnum primer) primers with IMR 4064.

Thx for replies...I'm going to chrono a few...If I decide not to use,will contact about trading.

I've used the Fed LR Mag primers in my 30-06 using imr 4831 powder ammo in colorado for cold weather hunts in my 30-06 sako & 300wm sako no problems with excessive pressure but I don't load max.