Target chambers are a bit shorter than sporting chambers. It's the extra long case of Stingers that are causing the problem. There's a warning against using them in semi-autos with tight chambers. It may even be written on Stinger boxes.
People are like rifles. Some are tried and true, having great eyes, personality, and fun to be with. Others never seem to hit the mark with you. Still others go off half-cocked. Still, it's nice to know most of them.