I love my 7mm for shots under 100 yards wouldn't have it any other way. never used a 300 so i cant say anything about them.
Using BVAC 175GR Grand Slams
http://www.bvac-ammo.com/BV7MM-3N.pdf
when i hit them with 7mm they don't go anywhere
my 7mm savage is unported so it didnt feel to good at the range, but i put a nice recoil pad on it after the first year with it and it helps some when shooting at the range. do most of my practice shooting with a scoped 22 rifle so it keeps things in perspective.