I LOVE the Nosler BT 125 out of the 14 contender 3030. It mushrooms perfectly at the lower velocities. A medium load of 748 works great for me. I just started with the Lyman manual loads. 38 grains produced STELLAR results. Good rest, good technique, you'll hit what you are aiming at.
If you really want to be anal, get a neck turner (outside NT), and follow varmint al's instructions. Helps a little bit. Regardless, properly built handloads out of the contender with this combe should be impressive.