Stick with bullets in the 200 to 210 grain range. The problem with reloading the .44-40 is the combination of a stubby bullet and thin neck. It is easy to get the bullet misaligned and then the case neck crushes, and you have a ruined case. Maybe in an original Model 73 the barrel metal would be so soft that continued use of jacketed bullets might cause excess wear, but in a modern weapon, I don't think you would live long enough to shoot out a barrel. One problem that I have encountered with my Rossi Model 92 is that , with jacketed bullets, the bullet will recede into the case if loaded into the magazine. I have tried two different brands of reloading dies, and the only way I have gotten around it is to use lead bullets. This problem has not occurred with factory ammo, but it is loaded to only about 1,100 f/s in a rifle. It is possible to get to 1700 to 1800 f/s by reloading. Even a case full of black powder will give you about 1300 to 1350 f/s and that will drop a deer very nicely. Trim length and length overall are both critical in the Model 92, and accuracy will suffer if you don't keep a close eye on them. That said, it is a great rifle to shoot and carries well in the field. The .44-40 was the .30-30 of the 19th century and is as accurate as most other rounds fired out of a lever action.