Got a .58 Renegade barrel (only) from FRO today. Gonna put it on my old .54 Renegade. Can't wait to try it out at the range; but there's a .50 and a .54 waiting in line for a range session before I get to the .58

Got some .58 Maxi Hunters and some Mini-Balls to try in it as well as two sizes of roundball. Going to stick with light (under 80gr. RS) charges at first. This calculator:
http://www.beartoothbullets.com/rescources/calculators/php/thornily.htm
says the .58 has plenty of moxie for deer even at low velocity. The rainbow trajectory might become an issue though.

My previous .58 experience is with a System 1 inline. That thing drove tacks with old-style .58 Mini-Balls as long as I kept powder charge around 60gr. When I pushed it harder, accuracy went to pot and the barrel leaded up. Even 70gr. was too much. I think the newer design Minis can handle heavier charges, but there's still the issueof leading with Minis....they don't have deep grease grooves like a Maxi. Crisco bullet lube didn't quite hack it when I tried. Going to try Lee liquid Alox this time around.

Fox Ridge sent me a tang with the new .58 barrel. I suppose it's fitted to the new barrel's breech. This is a nice touch that you don't get with the Green Mountain drop-in barrels.
FWIW
Bob