What would cause the primers to back out after firing? These are sticking out about 1/16". Not all of them stuck out but is seemed like the first 5 or so did and then it seemed ok and then only once in a while one would stick out.

Gun: USGI M1icon Carbine
Bullet: Hornady 110gn round nose
powder: H110 @ 13.5 grains
primer: WSR
brass: LC 79
trim length: 1.284
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