Semi Auto failure
Had a Taurus 99AF fail on me twice and locked it up very badly (ie you coudl not open the action "normally".
1) One "leg" on a locking lug broke off
2) Barrel developed a "crack" on it's base just ahead of the chamber
With alot of effort I managed to to open it up for # 1. With No. 2 had to use a helper to hold a wood block so I could hammer to open the action.
Neither load was an overload as I retrieved the spent case (as they wern't able to eject). IMHO it was metal fatigue. I do not load to maximum levels and use cast bullets at low-medium recommended powder levels...I don't use a progressive press and I didn't use the wrong powder.