Good comments by Daryl (as usual)

As you have not stated the action type then it is hard to comment on action strength, but many of the break-open actions only have one locking lug.

As a Plan B, why not find a shot-out ex-target rifle barrel in either .308/ 7.62 or .303, and use that as a liner? Then chamber it for the .32-20 WCF round. This can be loaded up to 2,000 fps and had killed many deer. The fast rifling twist is no problem.

I have two - a double hammer gun with two ex-SMLE barrels (left-hand twist) and also a side hammer break barrel with an ex- .308 barrel. Both fire the same 120 grain lead bullet load brilliantly.

HB