To answer the OP, if you like the 10mm, you'd love the .41 Magnum. There's brass and all the rest aplenty out there - check AmmoSeek. If you want an actual .41 Special, Reed's Ammunition and Research (
Reed's Ammunition & Research, LLC) will happily sell you components or loaded ammo... or you can simply reload with a light .41 Magnum charge. I like Reed's Gold Dot Magnum load; a 210gr at ~1200fps works for me, but I'd go with their Barnes XPB load for hunting. LAX Ammo has good-to-great prices, and their 210 gr at ~1000 fps is smack dab in .41 Special territory, and a nice target round. Ballistically, weight being equal, the. 41 Magnum is equal or better than a 10mm, though combat reloads will be faster in the 10mm. If that's the issue, then a Desert Eagle in .41 Magnum would be an option, but pricey vs. a good 10mm. In the end, personal preference is what it is, but I have several M57/58s, and my M58 shooter gets to the range a lot. FWIW.