use the SP.. not the SPSX then. unless you are shooting them real slow...
don't remember the formula, but Hornady told me that the SPSX was good for a MAX of 180,000 RPMs
so need to slow them down velocity wise if you are using a faster twist..
I was using a load that was vaporizing them right out of the barrel...
their formula, they were leaving the barrel at OVER 300,000 RPMs...
they just looked like your cold breath on a winter's day.. except this was when it was 100 degrees outside...when they were leaving the barrel...
I can tell you it is fun to watch it tho, when you shoot it on a real foggy day, like we get here in Oregon in the winter...
you can watch the parts flying in all directions when it comes apart, leaving trails thru the fog...
