Here's a pic of a .223 case with a KVB-223 primer. It was the highest of a sequence of five loads of RS52 starting at 1.69 grams, with 0.01 gram increments.
Case is PPU, bullet SMK 80 grain Matchking, COL 65.6 mm. Barrel 30", 8 twist.
MV was 3140 fps (Magnetospeed). Apart from the volcano, the primer looks OK, still plenty of radius at the edge.
RS52 is now my .223 powder............
Dunno why the pic appeared where it did..........
H/man
Apologies, this thread seems to have wandered off topic............