[snowtigger]

Hi, Newbie here. This is my first post and my first Contender. I have an old G1 contender with a octagon 410 barrel.
I need to know if it is chambered for 2-1/2 inch or 3 inch shells.

 

[Tailgunner]

There is either a step or a taper start (the forcing cone) at the front of the chamber area. Using a straight edge, measure the distance from the breach to the step/start of taper. That is the chamber length

 

[snowtigger]

Thanks ,That will work.