Thanks for the advice! A lighter load (easier on the wrist) and more shots/magazine to boot!
I had a look at the minishell pages on the Aguila website. The potential for jamming even the modified Mossberg is a concern to me; it might be better for me to go with the Winchester Defender 1300 (18"), since Aguila's testing indicates it works well out of the box with the 1 3/4 shells... you think?
I took the Mossberg to an IDPA match and had a fourteen year old girl shoot it. We took videos but the guy using the camera had some problems. Also, the girl didn’t have the strength to yank back the pump so the shells could eject. That was the only problem she had with the modified tang. This tang also doesn’t have the recommended downward end angle I mentioned and there was still no problem of chambering.
I still use the regular OOBuck for defense. The Aguilas are only a fun match load if I ever used it as such. The IDPA demonstration was only to see if it worked under less than expert hands.
Don’t use the Aguila field grade shot in the Mossberg. The shells don’t eject because the rims blow out and you have a failure to extract. Only use the combination buck and shot.