Sorry, but the drum won’t handle 3” shells, unless you are referring to the metal drum.
That has a number of problems, according to the forum members.
The plastic drum is for 23/4” shells, and actually only handles 2.40 length shells. That means that even some 23/4 shells won’t fir. Some Wolf shells come to mind.
IMHO, the drum is best for nasty crowd scenes, riots in the Big Sh*tty, or a pack of wolves closing in.
PS Beware of Winchester Universal shells for practice. Supposedly, they wont reliable cycle the Saiga 12.
PPS Reliable 8, 10, and 12 shot mags are available for the Saiga 12. Do not use 3” max loads in the 12 shot mag, due to inertia. Cut it to 8 or 10 rounds.
Dixie makes a superb range of 12 gauge shells, some of which equal or exceed the old Paradox shells.
I wanted to load it with those flamethrower rounds, but that would not be too popular these days what with all the metrosexuals and all... Yet, again, I digress... a flaming blackie running through a tinderbox would be really unsafe.... Desert Eagle????