TH,
Maybe I missed it, however have you actually measured your 10 bore's barrel groove to groove diameter?
As Daryl has alluded to, the bore diameter will be different for brass case -vs- paper case rifles.
Paper case rifles having a commensurately smaller bore diameter to accommodate balls/conicals that will fit the smaller inside diameter of a paper case. (due paper wall thickness)
As well, determining the twist will give you a hint as to whether it is a "round ball only" rifle or one suitable for round balls and conical bullets.

In any event the old Jeff Tanner company ball moulds are your friend:
https://www.ballmoulds.com

Proper roll crimp of a 10 bore paper case with ball or bullet may require modification of a standard shot shell roll crimp tool.

AFTERTHOUGHT:
TH: It occurs that you maybe already knew all the above, forgive me if I have merely been preaching to the choir.

Your 10 bore will give you hours of enjoyment!

- Mike