Hi,
Found a contender with a BB barrel labeled 6.5mm RSV . Not familiar with this cartridge? Any idea of parent cartridge? Ballistics?

Any input appreciated.
Thanks
Doug

You could make a chamber cast or simpler would be to call Fred at Bullberry and ask.
Being a contender would make it a low pressure round and probably rimmed. A few favorite parent cartridges are the 444 Marlin, 30-30 Win and 225 Win.

David

Bobby Tomek may know.