Caswell Ranch
.410
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I use minishells exclusively in my Shockwave. My setup is similar to yours. I keep mine “cruiser ready” with an empty chamber, 9 in the tube (I have a +1 mag extension), and 12 more in the 6-slot side saddle.
The only thing I see with the 2 1/4" shells is in some guns they are more reliable than the 1 3/4" (mostly guns that will not run 1 3/4"), remember when estimating capacity the length given for a shotshell is the spent length. 1 3/4" are 1 1/2" before, 2 3/4" are 2 1/2" etc , barrels have a forcing cone that starts past the full length(spent length)to allow hull and shot to occupy the same space or pressure would spike as the shot tried to push past the unfolded/rolled hull (chamber length). Some people have forcing cone lengthened but in most cases is not necessary and in part why the mini shells even at full size velocity feel mild, the Mossberg is chambered for 3" shells ( forcing cone starts after 3") giving a lengthened forcing cone by default . Anyway back to the question, they don't buy you any advantage.
P.S. Lengthened forcing cone can also include making the transition to bore diameter less of an angle.
As for experience with ammo types, shot most everything for 12 gauge 240,000 rds down range.
Handgun 1.5 million rounds down range.