RE: Sig 239 40 cal / 357 sig jamming
Manually placing the round into the chamber is easy. It is not tight. I am going to video tape firing the pistol with several different brands of ammo and try to determine the percentages of each type of jam with each ammo. Hopefully this will clue me into the problem. Now I know it jams several different ways and about 2-3 times per clip.