I made an error purchasing 44 magnum reloads at the gun show. The seller taper crimped them for use in a Desert Eagle instead of roll crimps required for use in a revolver. I didn't notice that until I fired the first round in a S&W 629. It fired fine, but all of the other cartridges unseated and jammed the cylinder. I was able to push them flush to get the cylinder open. I used a Lee Factory Crimp (roll crimp) for 44mag to fix the remaining cartridges. The unseated ones were unloaded. I just burned off the powder and replaced with a known volume of Win 296 (H110).
Sorry to hear that.
Before I got into reloading, I read everything I could in the topic and one item that popped up repeatedly was, "don't buy reloads from someone you don't know/trust.
The primary concerns were double powder throws (big boom) or a skipped powder throw resulting in a squib, with the subsequent round blowing the barrel.
https://en.m.wikipedia.org/wiki/Squib_load
https://squibloads.files.wordpress.com/2010/04/squiband1911.jpg
ALWAYS wear eye protection.