There's been a run on ammo of all kinds in Texas near me, to the point where you can't find any 12 ga 2 3/4 in shells in any of the stores or even online. (I finally ordered some from RST Shells)

I have a supply of 2 1/2" shells for my British guns. Wondering if these will work in a Mossberg 12 ga pump I keep at the farm for use on crows.