You might be able to rig something up Semi, but you might risk deforming the hollow base if they're not centered really well. If the base is deformed even slightly, it may not expand properly and gasses will escape around the bullet. If it were up to me, I would source out a better quality mold from someone such as NEI for a quality rifle such as that. Seems as though I've heard and read as many bad reports about Rapine molds as I have good.

Don't know if I ever mentioned it but, I have an original 1858 two band Enfield like yours. Sure wish it could talk...

BPS