What did you do at the range lately?

[Oscar77]

Practicing shooting, had the unfortunate event of a gun or ammo malfunction.
. The load was 19.8 gr of 4198 with a 60gr vmax. It is a light load that would eject the shell, but not enough to pick up the next round in an AR. It is very accurate, produced a 1" 3 shot group at 200yds. I am not sure if it was over pressure or the gun dropped the firing pin with the bolt not fully closed. It blew the magazine out, broker the follower, damaged the metal box, broke the mag release and the extractor. I haven't pulled the gun apart yet to look for any other damage. My only injury was a small burn to my trigger finger.

IMHO, you might also look at the idea that the load is too light.
Some powders do not handle extremely light loads well and develop high pressures extremely fast and rupture the case........