Depending on your rifle, that will tell you what powder charge you can shoot. You might not get good enough accuracy with 70 grains of T-7 and a Shockwave for instance. You are going to have to shoot what is most accurate.

You might want to look into smaller powder charges with something like a ballet or maxiball. You are still pushing some good size bullets and with a moderate powder charge and correct shot placement they should be relative low in recoil and accurate. I would suggest a 270 grain buffalo ball-et or a maxi ball and see if you get good accuracy with that.. 75 grains and you have a low recoil deer killing load to 100 yards easy.