Im with RB,the 1:48 twist will be fine with a PRB.Thats all I use in my TCs anymore and rarely use maxi-balls.The .50 bore will be more than enough for coyotes with a PRB,it flattens whitetails and mulies for me.
The reason TC stopped making :cry: the New Englander and other models,Senecca,Cherokee,Pennsylvania and for awhile the Renegade,as the demand for inlines increased the demand for sidelock guns decreased.
There is nothing wrong with the New Englander,its a great gun.Many sidelock enthusiastes who like TCs want the older discontinued models.I dont know what the New Englander originally went for,but im sure today its worth more than what it went for originally.Enjoy your rifle its a keeper.