I used a coleman stove for years. When I lived in a trailer park, I would pour boolets sitting in a kitchen chair with the side doors of my van open and the stove insid the van. Neighbor hood kids would come along and ask me what I was doing, I told em I was making sinkers. They said "thats a lot of sinkers".
The stove worked great except the grate did get red hot and bend with a full pot of lead (20 lb). It got kind of harry for a minute there, but none spilled. It bends s l o w l y.
The fumes from the flame were terrible.
I now have a garage, a propane canning stove and Electric RCBS bottom pour 20 pounder. I also got rid of the old dodge van a long time ago