You should seriously look at a muzzleloader. I have all of the following and all are great out to 150 right out of box. 200 with a little work up on the load.
http://www.cabelas.com/cabelas/en/te...815&id=0033480
http://www.cabelas.com/cabelas/en/te...815&id=0054218
http://www.cabelas.com/cabelas/en/te...233&hasJS=true
Hope these helped