Good morning 58Ball.
In the rifle you describe I'd probably try one of the 250 to 280 grain hollow base molds as have been made by Lyman and RCBS, and a push through sizer.
This is from some in process planning notes for a project rifle I've been threatening to jump into. A nominally .45 bore octagonal to round contour barrel would be added to a CVA .50 percussion, slimming down the stock, repairing a crack in the fore end and getting rid of the blocky end cap. Make it go to my shoulder like a .22RF. Any how, enough about my
maybegonnadoitsomeday project. These notes are included just because it provides a little info put together so far on those diameters of molds and maybe it mite be of some use to you.
Mold No. | Make | Diameter | Weight | Paper | Comments | .458NE PP? | Forward? |
45 Maxi | TC | | | | | | |
454613 New | Lyman | | 265 | | Has plain base and hollow base plugs. | Could paper patch as-is. | C ring .450"Ø base plug |
45-280 | RCBS | 0.444" | 280 | Brown filter paper. | .525"Ø plug | Could be enlarged to smooth sided. | Could turn this into a PP for the .52 rifles. |
445-ED | Challenger? | 0.445" (.443"-.447") | 262 | | Flat nose wadcutter. | | |
445599 | Lyman | 0.445" | 250 | | Base plug is missing. | | |
445369 | Lyman | 0.445" (.444-.446") | 291 | | | | |
450229 | Lyman | 0.455" on bands.
0.445" on plug. | 155 | | Base plug is missing. | | Use in Pietta revolver? |
454613 Old | Lyman | 0.456" | | | Has interchangeable base plugs. | | |
460-236-SP-BH5 | NOE | 0.460" | 236 | | Plain base. | | |