I don't have a contender in 45-70 but will add from what I have found from shooting my Sharps rifle in 45-70. Even with cast bullets Lyman #457193 405 gr FN at 1400 fps or the RCBS45-500BPS 500 gr at 1100 fps I have never recovered a bullet no matter where it went into a deer. It lets the air out of them pretty quick and as the old buff hunter said. "You can eat right up to the bullet hole". I have a friend that used a 16" Contender in 45-70 on deer with the 300 gr Sierra HP and the suggested hunting load in the #5 Sierra manual of RE-7 46.6 grs for 1700 fps. It was a hand full but it really did a number on the one deer I saw that he took at about 50 yards. I use a 14" 30-30AI Contender with 125 Noselr BT at 2670 fps. It kills them just as dead, mostly in their tracks, and does not have near the bone jarring recoil.