Welcome!!! :thumbsup:
50 or 54 caliber will do nice on deer.
See if you can get to a gun shop or two and shoulder up and handle a few muzzleloaders. See what feels and handles best to you.
Don't forget you will also need about $50-100+ worth of accessories as well (Shooting pouch, powder, caps, projectiles, maintenance items and so on).
Good entry level production traditional styled muzzleloaders can be had from for more information:
A caplock Thompson/Center Hawken or Renegade
www.tcarms.com
or
Lyman Caplock Great Plains, Trade or Deerstalker.
www.lymanproducts.com/lymanproducts/index.htm
or
Pedersoli Caplocks
www.davide-pedersoli.com
or
Traditions Caplocks
www.traditionsfirearms.com
There are others as well.
Also, don't discount the used muzzleloader from a gun shop. They can be a very nice starting place if you know what to look for and can save a great deal of money. Basically you are looking in the bore and the mechanicals of the used ML to determine the care or neglect. Black powder rusts if left to do so.
Also, try the search utility here on the forum. Lots of information. Lots of really knowledgeable folks here.
Again welcome!
:hatsoff:
Tahquamenon