Any experience using 2 1/2" shells in a semi-auto?

[Caseless]

I wonder if these shells will feed and extract in a Benelli M2 or a Saiga-12.

[geedavell]

2.5"?
I shoot 2.75 in my beretta A400 with no problems

[Caseless]

Yep, Eley 2.5-inch shells.