View Single Post
Old October 2, 2011, 10:15 AM   #11
black mamba
Senior Member
 
Join Date: September 13, 2011
Location: SW Florida
Posts: 890
Monolithic bullets (solid copper) like the GMX are difficult for the rifling to engrave, so they need a "running start" into the lands. Wncchester is correct, seating deeper in the case lowers pressure, at least for the first 1/4" off the lands.

I would load a dummy round (no powder or primer) to maximum magazine box length and see if it will feed and chamber. If you do all your load work up with this length, then when you find a max pressure load, start adjusting your seating depth farther off the lands (shorter OAL) until you find the best accuracy. This will give max velocity, safe pressures and good accuracy.
black mamba is offline  
 
Page generated in 0.02962 seconds with 8 queries