Have a gunsmith examine it, especially if you remain unsure about the caliber.

There shouldn't be any serious problems with it unless it's been rechambered for a higher pressure cartridge. These old actions on this model are a little softer and tend to stretch under the higher pressure cartridges.

I'm probably just going to take mine to the range, fire a round and examine the cartridge to see if there are any issues. I've been shooting old rifles my entire life.