Very good information has been given. My experience is with Marlins. I have a .35 Remington, .44 mag & a ported Guide gun in 45/70. I shot my first deer with a 30/30 and it performed great, little recoil. The .35 is a good cartridge. One shot kills on hogs. The .44 mag hurts my shoulder and shoots pistol bullets which do not always hold up. Unless you shoot hard cast, they are not good game "getters". The 45/70 I like and you can go mild to wild, with different factory loads. If you are not going after big game, (bear, moose) I suggest a 30/30 or the .35 Rem for deer. The ammo is cheaper, easier on the shoulder, and old Marlins are available in these calibers.