There's about 15 Handi rifles reamed to 445 supermag,and the owner's are very happy with them.Just about everyone is getting 1 1/2" groups at 100 yds. with the heavier bullets. All of the guy's with chrono's are reporting 1975 fps. with a near max load of 296 and the 300 gr.bullets.Mine likes the 265 gr. Hornady with a near max load of 296 at 2150 fps. and 1 1/4" at 100 yds.
Now for the bad news,the chamber on the Handi's is .006" over and the brass will swell out past the web of the cartridge but you can neck size only ( with 44 mag dies)and they shoot fine.They perform very well on deer,wild hogs,and just about anything you want to shoot with them. I hav'nt heard anyone complain about the 445 that has one,they all like them very much. They use less powder,have less recoil,and you can still shoot 44 special,and 44 mag. ammo in them.
The .432 bore on most of them does not affect the accuracy as much with the extra speed you get from it. Its quite a cartridge for hunting and I've taken alot of hog's and deer with mine. Digger