About a year and a half ago I seen in Alliant's 2005 Reloaders Guide data showing 2400 in 38 Super with a Hornady 147 gr. XTP. So it got me figuring out to try it in 357 SIG. The SIG has a slight more volume (.01587 cubic volume, with consideration of the SIG bullet is seating about .105" deeper) than the Super.
I used the RMR 147 gr. FP MW, which is .019" shorter than the XTP. Alliant's max shows 10.9 gr. for 1215 fps and psi at 33,600. I started at 9.9 gr. and worked up to 10.7 gr. I took these to the range and shot up to 10.3 gr. Those were good on accuracy. I couldn't get the chronograph to read, bad cable I believe. So the 10.5 and 10.7 gr. will have to wait.
I know there are plenty of other powders that are better suited for the cartridge. But I always try to have plenty of 2400 around. And what's not to like of having another reliable load to fall back on.
I used the RMR 147 gr. FP MW, which is .019" shorter than the XTP. Alliant's max shows 10.9 gr. for 1215 fps and psi at 33,600. I started at 9.9 gr. and worked up to 10.7 gr. I took these to the range and shot up to 10.3 gr. Those were good on accuracy. I couldn't get the chronograph to read, bad cable I believe. So the 10.5 and 10.7 gr. will have to wait.
I know there are plenty of other powders that are better suited for the cartridge. But I always try to have plenty of 2400 around. And what's not to like of having another reliable load to fall back on.