I use CCI magnum primers sometimes in my .357 and .44 magnum loads. A few years ago Alliant showed magnum primers for these loadings on their web page. The answer I got upon asking why was simply that that was what was on the bench the day they did the testing. I use jacketed 200 grain bullets.

I figure a magnum primer accounts for about .2 grains of powder. Since everyone ought start low and work up I don't see a problem. I use Winchester Large Pistol primers when loading 9.5 grains of Unique for my .44 magnum, and I use CCI Small PIstol magnum primers when I load 6.4 grains of Unique for my .357 magnum snub nose revolver. I use 158 grain jacketed bullets.

I may not need them, but if they are what I have on the bench, I use them. Have had no problems using them. Then I have had no problems when I did not use them.

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Hook686