Ditto what Buzzcook said, at the stated ranges the 30-30 will do the job 7mm mag has too much recoil for that distance and most marlins have more accuracy than my 742. I've shot deer, bear and moose with a 30-30 my son has that Marlin now so I use my model 88 in .308 win for anything over 50 yd. anything less its .357 time, except for moose, that .308 is gettin too heavy for this 57 year old body to go swamp sloppin with. Just use the one that you feel comfortable with and you shoot the best groups with put the lead in the boiler room and go gut and drag. Where are you hunting? Have fun thats what it's all about.
Oats that have already gone through the horse are always cheaper than oats that haven't !