I found a set of CH4D dies on gunbroker fer cheap a month or so ago. rcbs 22 shell holders fit the Jamison brass real well.
I think it would be possible to get by without resizing if John got that chamber cut tight. Just deprime, prime dump in the powder thumb in a bullet and go.
.431-.433 seems to be the favored pathced bullet size before patching. and Goex 1f , and KIK 2f are the powders a friend of mine has been having the best accuracy with.
The RCBS mould for the 43 should work for a grease groove bullet, it drops at 390 from 20-1 and just at .447 .