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The general consensus that I see is that standard primers are used with 2400 powder, but out of curiosity I did some testing. I was working up new loads for my. 357 anyway, so I compared the two. My goal was about 1300 fps with a 158 gr bullet, which I achieved with 15.4 grains* with a CCI 500 primer. When I tested with a 550 primer I got some interesting results. First I reached my velocity requirement at 15.2* grains, and my SD really improved.
.357 158 gr JSP 2400 15.4 gr cci 500 primer; Average: 1295 fps ES: 62 SD: 23
.357 158 JSP 2400 15.2 gr cci 550 primer;
Average: 1303 fps ES: 37 SD: 12
Gun: 4" Ruger security six.
Now this was only with 10 shots so not exactly super scientific, but still very interesting. I think I will switch to a 550 primer for all my .357 and 2400 loads, and I intend to do some testing in my .44 as well.
*safe in my gun but not necessarily in yours, always work up.
.357 158 gr JSP 2400 15.4 gr cci 500 primer; Average: 1295 fps ES: 62 SD: 23
.357 158 JSP 2400 15.2 gr cci 550 primer;
Average: 1303 fps ES: 37 SD: 12
Gun: 4" Ruger security six.
Now this was only with 10 shots so not exactly super scientific, but still very interesting. I think I will switch to a 550 primer for all my .357 and 2400 loads, and I intend to do some testing in my .44 as well.
*safe in my gun but not necessarily in yours, always work up.