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Discussion Starter · #1 ·
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.
 

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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
 
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