sharps4590,
In response to your question about my Sauer's chambering (German & Austrian Sporting Guns), I have a Model 32 chambered for the .43 Mauser as well; its proofed "Nitro" using an 18 gr (278 grain) K.m.G. (Kupfer Mantel Geschoss - Copper Jacketed Bullet). The "Henry" style bore and groove combination is smaller than yours as it shoots a .439" (.43 Spanish) bullet. I'm starting off using 300 gr Hawk bullets as that is what the guy I bought it from was using. I hope to get out relatively soon to see how it does.
Buchseman
