Chuck,
Agreed, funny how the law of unintended consequences works, eh?
As for the Aguila shells not working in pump guns; I have tried these shells in 2 Win. Model 12's, worked OK with a little "bobbling" required in both. 2 870's, worked GREAT in one of the older Wingmaster's that had seen a lot of use (perfectly!), not so well in the other, a High Standard Sport King, didn't feed well. A Win. 1300 which worked perfectly, a Win. '97 worked well (read perfect) if pumped with authority, not so well if just casually working the slide, a Mossberg 500, didn't work very well. I tried these in several O/U and SxS's... if I was too relaxed, any of the guns with inertia set triggers wouldn't always set the second BBl...another argument for two triggers! If you checked Aguila's website they had some interesting mod's you could do to various pumps, not sure I'd want to change anything on any of my shotguns. As I stated previously, these are great training loads. Aslo make a good conversation starter.
I use them in the inexpensive single-shot 12's with a youth stock for trining young new shooters- recoils like a .410, hits like (at least) a 28 gauge. The balance of the inexpensive New England Firearms single 12 gauges must be felt to be believed! close your eyes and mount and swing one-
Hap