UPDATE: Just saw a video on an auction in Maine last year, where they had several 4 bore double rifles for sale. Also had a box of ammo for one of them and that was the clencher for me. Looked the same as what they were using in the film. Thus, I am fairly sure they were carrying 4 bore, black powder or nitro, double rifles.

Some mornings, it just does not feel worth it to chew through the straps!~