6x45

[37L1]

I was out walking the dog and thought suddenly occured to me I used small pistol primers on the original rounds I loaded.
Since the pistol primers seated easier I decided to switch to small rifle primers.
The 5/16" inch 5 shot group at 50 yards was shot with small pistol primers.
The 2 to 3" ten shot groups shot at 100 yards were shot with small rifle primers.
I had read with more vigorous primers the priming charge can push the bullet and powder out into the bore causing inconsistent ignition.
I did buy the Lee factory crimp die for 6x45 with my last order since I thought I might have a use for it. Keeping the bullet in place longer could be it.
I will load some more with pistol primers since I like small groups.

I think you are asking for trouble using small pistol primers in an AR-15 platform. You may want to google "slam-fire" if you don't already know what that is.

I would recommend that you work up a load using small rifle primers with the thicker cups, you won't have much problem finding a load that will shoot bug holes with your 6x45.