Robert King Posted May 16, 2011 Share Posted May 16, 2011 I am loading 40 for major from my glock. Using titegroup and 180gr xtreme plated bullets. I normally use fed small pistol primers, as I have a ton left over from my revolver loading days. I found a few thousand federal magnum small pistol primers under the reloading bench and was wondering if anyone loaded with these and if I need to back off my powder charge. Link to comment Share on other sites More sharing options...
yoshidaex Posted May 16, 2011 Share Posted May 16, 2011 The spm primers will increase your fps slightly. Maybe 50-100 fps. You can lower your charge weight by a tenth or two. But I would be more concerned about those plated bullets you'll be using. I never was able to get an acceptable group using plated by YMMV. Link to comment Share on other sites More sharing options...
G-ManBart Posted May 18, 2011 Share Posted May 18, 2011 No need to alter the charge. I've loaded both FSP and FSPM and the difference is well under 20fps in my guns (usually between 10 and 15fps). Link to comment Share on other sites More sharing options...
pjb45 Posted May 18, 2011 Share Posted May 18, 2011 My experience is the same as GMan. I have not seen a 50fps increase much less a 100fps. Link to comment Share on other sites More sharing options...
EkuJustice Posted May 19, 2011 Share Posted May 19, 2011 is there any advantage to using the magnum primers? Link to comment Share on other sites More sharing options...
9mmalpha Posted May 19, 2011 Share Posted May 19, 2011 is there any advantage to using the magnum primers? yes ... most of the time its available hehehe / Actually I think magnum primer is louder , that is just my observation , but of course i cant confirm it I may had been bias if i knew im using magnum primer. Link to comment Share on other sites More sharing options...
yoshidaex Posted May 19, 2011 Share Posted May 19, 2011 Oops. My bad. I was referencing my 9 major loads. The largest increase I've had is 70 fps using spm primers. Link to comment Share on other sites More sharing options...
TonyT Posted May 24, 2011 Share Posted May 24, 2011 everal years ago I made the mistaake of not loolking carefully before removing primers from the stores shelf and mistakenly purchased the SP magnum variety. I did not realize it untilI had used ca 500 in some mild 40 S&W loads ( American Slect, 180 gr. Berry's at ca 800 fps). When I chronographed those loads they produced ca 20fps more average velocity than those primed with standard primers. Link to comment Share on other sites More sharing options...
Blurryvisions Posted June 9, 2011 Share Posted June 9, 2011 you shouldnt see much of a difference, maybe 35-70 fps... use em up! Link to comment Share on other sites More sharing options...
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