Good Morning Gentlemen,

It appears determining the gunmaker might be a more daunting task than I originally anticipated, but that's kind of the fun of it! Thanks for all your input.

According to the chamber cast I made, the dimensions seem very similar to an 8x57. I have yet to find some soft lead to slug the barrel, so I am still uncertain whether it's .318 or .323.

Does anyone have any tips on how to determine actual shot shell length? In looking down the bore with a dial caliper, I have compared it with another shotgun stamped 16/70. The caliper seems to end at the same length, but the angle makes it difficult to be sure.

Thanks again for all of your help.

MJS