Good morning & WELCOME Mark !
I still have and use my Coleman 2 burner stove when up in Illinois for smalting only but sre have cooked many pots of boolits in the past oin it.
Down here in Peru I use a small 2 burner table top propane stove.
Sizing... In a pinch you can use your revolver cylinder to size down large diameter boolits. I do this for my 44-40 New Service. BUT remove the cylinder or run the risk of bending the crane.
Great to have you about !