Ric,
Maynards are maybe my most favorite single shot. Your very lucky to own it.
What is the barrel length please?
I have 4 different 40 cal rifles and if you wish I can check the twists on them. (sadly I haven't shot any of them for at least 10 years so I just don't remember the twist). My Farrow style rifle is a 40-60 Maynard. It would be a great choice for your relining.

Are you going to the Heritage gun show this morning? If yes we can talk there. I'll put a 40-60 case in my pocket just in case. I'll PM my cell number and you can call if you are going so we can hook up.