Gents, I have a Stevens 315 of 1930's vintage that appears to have 3 inch chambers. I have been shooting 2 1/2 inch shells in it for pest control around the ranch.

Could you please tell me when the 3 inch 410 was introduced? I was under the impression that it was introduced in the late '40's. If it was introduced earlier and this guns is bored for 3 inch I would like to use them. What say you?

Thanks.