Michiganiac,
I've got a .500 S&W Mag barrel coming from MGM for my Encore. 26" heavy, SS, throated for Hornady 350 gr XTP at 0.025 to lands. This will allow smaller jump for the 300 gr FTX as well. I should have it by end of enxt week if all goes well. They have been great to work with on this. According to Hornady, the 300 FTX out of 26" barrel with H110 should be around 2300 fps. Ran through my ballistics program and pretty impressive numbers pop up. over 3600 ftlbs at muzzle and over 1600 ftlbs at 200 yards. Sighted in at 150 yards, it is 2" high at 100 yards and 4" low at 200 yards. Recoil shouldn't be all that bad when comparing to slugs out of my Encore or even 300WM. Lots of calibers to look at, 44 mag, 445 super mag is real interesting, 357 max, .480 SW Mag all meet this requirement. The new slug sabots are right there with the 500 SW so not much difference. The 12 ga. Hornady SST is about 2000 fps + which is close enough to 500 SW. Plus, the 500 SW is legal in IN where I hunt mostly so I will have same rifle for both states assuming this goes through as written.
Muddyboots