I figured it out right after I posted. These newfangled smokeless cartridges confuse me sometimes. Looks like I need some .41LC dies...ThanksCR
I actually need .386 soft lead bullets since that is what Hoof Hearted recommends for his conversion and I checked with westernbullet.com and they actually stock these, so one problem solved. I didn't want to line the 1851 Navy barrel so I can still shoot loose powder and ball, so getting a Kirst cylinder reamed to .41 colt dimensions will allow bothe.CR