Seeing that I haven't kept up as much as I would like on this thread, I thought I would bring this back up for a few of the newer folks who are just getting into the wonderful world of the 41.
Somewhere back in the depths of this thread I am sure I have posted before that the Remington 200gr SJHP is a real tackdriver to those who might not know it. Loaded over 20.5grs of H110/296, it will deliver all of the accuracy you should need out to 100yds, and with little real felt recoil. If you can find them, they are a great bulk bullet and have served me well for hunting over the last 25+ years. I have cleanly taken quite a few feral hogs out just past 100yds with them using the load above and had complete pass throughs on them when not hitting point on the shoulders. Even then though they will flat out, slap a fat hog on the ground.
I also suggest that when you start out with fresh new brass that you trim to lenght. Just need all of the cases to be even and have square necks to allow for a good consistent crimp on each round. Also even with H110/296, don't get carried away and over do your crimp. You only need enough to actually hold the bullet in place, and not so much that your swedging the lip of the case into the jacket.
For cast loads my good friend and I have found that AA-5 and 9 have worked out great using the 200 - 215gr loads. Also we have found that getting much higher than a 14 BHN is not conducive to the best performance. Most of our accurate loads have been with the hardness running in the 12 BHN range. There are several great commercial bullets out there as well as a host of molds if you want to pour your own. My main mold now is the MP 410258 which drops around a 220'ish grain Keith SWC type solid or a 215'ish grain HP. This particular mold was designed from the ground up as close to the Keith dimensions as the folks could come up with. It was a group buy over on Castboolits, and I don't if or when it is or might be available again. That said however Accurate molds, as well as a couple of others, do offer great molds and can probably produce what ever you might need or want. For alloy using these molds in the 41 nothing really harder than a straight clip on wheel weight is really needed for most of the loads you will find your best accuracy with. Accurate will also cut a GC on most any of their molds not listed in the catalog with one, if there is enough room to do so. They will also work with you to get what your wanting IF it isn't already listed there. Their quality is excellent as well.
Hope this helps.