View Single Post
Old 02-09-2013, 17:57   #11
oneofthose
Senior Member
 
oneofthose's Avatar
 
Join Date: May 2007
Posts: 744
Quote:
Originally Posted by Zombie Steve View Post
I've heard about 2400 and magnum primers. I have one load with a 158 grain XTP I worked up before I started casting. I followed the recipe in Lyman 49 (including a magnum primer) and got almost the exact same results (also shooting a 4" barrel). Twice around the wheel and my extreme spread was 38 feet per second (13 standard deviation). Seemed pretty darned consistent to me. Cases fell right out.



Interesting.

Is there a general rule as to which powders require a magnum primer, and which do not? Is there an imaginary line somewhere on the burn rate chart that when crossed might require a magnum primer?
__________________
Eyes on the olive branch, arrows at the ready....
oneofthose is offline   Reply With Quote