Marc,
I shoot an Alex Henry, and have an original AH mold with inserts for solid point or hollow point, so here goes,
325 gr. hollow point, paper patched, soft lead, 48 gr of IMR 4198 topped by 12 gr. Dacron. The correct BP load is 4 1/2 drams of FG or FFG.
370 gr. Flat Point Solid (same bullet w/o the hollow point) will shoot fine with the above load or can be pushed to 50 gr. of IMR 4198.
Neither bullets are crimped for single shot use as it's not required and would only tear the paper patch and cause leading.
We could meet at the Guild Show next year to discuss this further as several members will be working up the same 450 BP loads or for 450/400 's for the 2008 Guild single shot caribou hunt I announced this year. Maybe you should join up with us.
~Barry~
