Well, first off, I handload.... SO, with that out of the way, here's my reasoning...
I began hunting whitetail with a handgun about 12 years ago with a 6" S&W 686 (iron sights only) loaded with 180gr. Hardcast or 180gr XTPs over a max load of H-4227. I knew that I was toting the smallest legal caliber for my state (WI) then (though now the laws have eased up on this a great deal), but the performance I witnessed on game was nothing less than outstanding. I guess I made sure to take only good shots that I knew were within my ability and I never had an animal move more than a few yards after it was hit. Also, over the years, I have posted my stories on the 'Net from many of these hunts.
Then around 1998/1999 or so, I caught "10mm fever" and bought (2) G-20s, (1) G-29, a 6.5" 610 classic Hunter, and a 4" 610. I hunted with the 6.5" and found it to be a wonderful platform. Then, after returning from a deployment in 2003, I began to consolidate my collection down to only those pieces I actually shot regularly. In the end, I kept one version of 10mm (the G-20), a 4" and 6" version of my .357s (both 686-4) as well as a few others (a pair of 642s, a G19, etc.)...
Anyway...then the seller's remorse set in.
So, I bought and sold a few more...and also began taking a serious interest in the .41 mag (& picked up a 6" S&W 57-2). My rationale was similar to what I thought about the 610 - basically, I saw both of these as having all the power I needed in a platform (S&W DA revolver) that had served me so well over the years. Also, I had owned a 629 "Classic Hunter" at one time that needed timing work sooner than I would have liked it to (thus, I sold it after it was fixed), and I had also seen a few of my pals' other .44 mag N-frame guns begin to show their age after a few thousand stout 240+gr. hunting loads (yes, a few THOUSAND - they shot steel plates weekly). Since I really preferred the feel and action of the S&W guns, I figured that the .41 mag was the way to go if I wanted to maximize (a) power over my .357, (b) the long-term durability of the firearm (in this case, an N-frame S&W).
Further, I figured that if I honestly thought I were ever in a situation where I needed "more gun" than what a .41 mag offered, I would necessarily also think I needed more than a .44 mag too. While the .44 (.430) does hold a slight edge in raw HP over the .41, I just didn't feel that this marginal increase in energy was significant enough to justify owning a .44 AND a .41 since I could not think of any task that a .44 mag could accomplish that my .41 could not. In the end, I decided to stick with the .41 mag and .357 mag in revolvers and keep the 10mm confined to my autos. I guess if I ever do feel I need "more handgun" than my .41, I'd probably step up to the .454 Casull in a SRH as I view it a "real" gain...but, that said; I really don't think I'll ever actually take that plunge. Most likely, if I were confronted with such a situation I'd just choose to tote a 12ga. Rem 870 + slugs as a primary weapon and keep my 4" .41 mag on my hip.
Thus, I guess the .41 mag is, to me, a "44 mag-like caliber" that will allow my N-frames to keep on ticking longer than they might if few a steady diet of equally-maximized (HOT) .44 mags. I think the .41 mag does everything I'd want either caliber to do...and after all, the job I now have my .41 mag assigned to (whitetail hunting) is one I used to use a .357 mag to accomplish with good results anyway.
- My .02... YMMV.