Measure the chambers.

Hammer gun
 

So, does the hammer gun have 32" barrels or have they been shortened?
And then, what's the serial number and barrel length on the other gun?

Will have to measure those barrels later.. serial number is 51221

Hammer gun #51221 is listed as 30” .

I’d assume it was 2 5/8” and since it’s Damascus I’d shoot nothing heavier than something like RST 1 1/8 ounce loads maybe a 1 1/4 ounce load if they make one that isn’t stout .https://www.rstshells.com/store/c/3-12-Gauge.aspx

OK.. Back at the office.. Wanted to say thank you again to All before I close it out.