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Details/Conditions: .45 Colt Uberti '66, PGW Super Short Stroke kit, 200gr RNFP w/slightly over minimum published load of TrailBoss, Federal standard large pistol primers, 0 to once fired Starline brass(mixed box). 750 to 1000(near as I recall) of this same load fired with no problem, ammo stored in car overnight at approx 25 degrees F, more blow-back(as determined by casing grime) than usual(something I've noticed with these loads when it's particularly cold), been practicing(I know, don't judge) so cycle time is improving lately, temperature at shoot was high 40's low 50's, shooting multi-tap targets, Problem: On 2 separate stages, primers backed out of the pockets(first time I've ever had this happen), disengaging the brass from the extractor. One resulted in a jam leaving 7 in the tube, the other was on the last shot and earned me a MSV. Questions: Even if under pressure conditions existed, and they contributed to primer push, how can a primer make it's exit with the bolt closed, head space would have to be huge(doesn't seem to be any evidence of wear or other reason for the head space to have increased)? Is it possible that I'm firing slightly out of battery, thus providing the increased head space, but wouldn't it be odd that the primers exit pressure would overcome the pressure on the casing against the bolt face? What think ye? And if you've experienced something similar, what did you do about it? Help SS
