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Due to running out of LP primers and SP primers, I did an experiment with SP magnum primers instead. I did the exact same load workup, same gun etc., I'm just not sure how the ambient temperatures compare, I didn't write down the temperature for the first load workup.
My first 45 ACP workup last year was misc. brass LP primer, Extreme 200g plated RN bullets, with CFE pistol, coal=1.250. everything was the same between last year and this year except I used CCI Magnum SP primers instead of CCI LP primers.
LP results for velocity were, 6.3g=791, 6.5g=758, 6.7g=830, 6.9g=829, 7.2=894
SP magnum primer results were, 6.3=663, 6.5=742, 6.7=662, 6.9=762, 7.2=792.
Note, 6.3, 6.5 and 6.7 had a few failures to cycle, also it was 35 deg F today.
Maybe someone here could explain why the SP magnum primers produced such odd and slower results than the LP primers? I also understand that no load data anywhere suggests using SP magnum primers. Thanks
Due to running out of LP primers and SP primers, I did an experiment with SP magnum primers instead. I did the exact same load workup, same gun etc., I'm just not sure how the ambient temperatures compare, I didn't write down the temperature for the first load workup.
My first 45 ACP workup last year was misc. brass LP primer, Extreme 200g plated RN bullets, with CFE pistol, coal=1.250. everything was the same between last year and this year except I used CCI Magnum SP primers instead of CCI LP primers.
LP results for velocity were, 6.3g=791, 6.5g=758, 6.7g=830, 6.9g=829, 7.2=894
SP magnum primer results were, 6.3=663, 6.5=742, 6.7=662, 6.9=762, 7.2=792.
Note, 6.3, 6.5 and 6.7 had a few failures to cycle, also it was 35 deg F today.
Maybe someone here could explain why the SP magnum primers produced such odd and slower results than the LP primers? I also understand that no load data anywhere suggests using SP magnum primers. Thanks