I don't expect that a properly loaded .35 wouldn't kill deer at 200 with a round nose or flat nose bullet.
Wouldn't buy out the store on that stuff, unless it's a good deal. I buy factory for the .35 only because I couldn't find brass. And if you reload, you might want to check the length of that stuff. For 45-70, the brass was short enough to be a pain.
Hand loading is the way to go, especially for the.35. It is loaded very low pressure in deference to the old Remington model 8 semi auto. Can easily be brought up to 30-30 pressure and beat factory loads by a couple hundred fps.
Could use gas checked cast, and some guys have had success with .357 pistol bullets.