In TC I have a couple of the Big Boars, along with a Hawken mounting a 58 cal GM drop-in barrel and another Hawken with a custom 24" tapered barrel in 58. Then there are my Investarm and GRRW Hawken 58's. Yeah, I like 58 cal!
The herd is kinda thinning on conicals available, but you might still run across TC Maxis and Maxi Hunters on shelves. Same for Hornady Great Plains. Buffalo made them at one time, and I see Track of the Wolf is listing them again.
Then there are the various minies, some of which you can buy cast and some you have to cast yourself. The LEE Improved minie has worked better than all the rest for me, with charges around 80-90 grains being most accurate and packing quite a bit more punch that traditional minies over their max of around 60 grains.
Lyman makes several molds for minies, but I'd go straight to the oversize LEE Improved. LEE also makes a REAL mold which works well, provided you put a lubed felt wad between it and the powder.
Best lube I've found for all of them is LEE Liquid Alox. Dip them twice and you're set with no mess like all the soft lubes.
LEE makes round ball molds in .562 and .575, but you have go to Lyman or someone else to get a .570 mold.
And yeah, you can flat light up your life with heavy charges under a heavy conical! I've never taken game with conicals in mine, but they're sure fun to shoot.