Neatest one I saw was made with an empty 8oz can of PVC primer.
Remove the dauber from the inside and drill a hole the same as the OD of a, let's say, 30.06 case at the base above the rim (use favorite rimmed cartridge).
Drill out the primer hole to open it up to the ID of the case, leaving the rim intact, and push the case through the hole in the cap from the inside. Then use some plumber's solder around the case/cap joint.
Push cotton wick up from bottom. Fill with fuel of choice and light. The brass case just looks right on a bench...
and I see that Steve already mentioned it...
