i have cut a 20 lb propane bottle in half and used the "handle end" turned upside down for my tiger torch burner stand and used the bottom half with a long ( so it can be safely grabbed immediately after a melt with any glove) re-bar handle installed...this worked ok but to fill muffin pans safely, i wanted a bottom pour outfit big enough to hold 50 or more lbs of melt at a time so i built one out of 8 or 10 inch or so pipe and 5 inches or so deep (big enough that i can skim ww clips easily and then "stir & flux" thoroughly) . There is a photo somewhere in this forum section here provided by member gnmonty of the outfit. It will do 100 lbs or so an hr.
The best muffin pans i have used are the "coated ones" from a dollar store...release ingots with just a flip over & never had a "burn through yet.