If it helps at all I don't have a 99/44 Deerfield but I own a Model 96/44 lever action which I believe shares the same barrel (1:20 twist I think) and magazine. It's a very handy little gun, and the removable rotary magazine makes it really easy to load and unload (for a lever gun) jumping in and out of the truck while hunting off old logging roads in upper Michigan. The magazine does limit COAL if you hand load or use custom ammo, and I have heard these guns can be a little finicky about what bullets you feed them where accuracy is concerned. Mine generally groups within 3 inches at 100 yards shooting Barnes 225 gr. XPB monometals, which have become my general purpose .44 Maggie bullet for both the rifle and my S&W 629 wheel gun.