yeoman
I will work - any way matehmatically it is suppose to work...
I can not located the original manual for my old 50 cal. CVA Hawken. I'm guessing it's a 1:48 twist.
You can got to CVA web site or call them and they will provide you with a replacement manual.
And depending on how old - it probably is 1/48 but it could be a slow twist PRB gun also...