A "noticeable difference" in kick between a 300 mag and a .308/.30-06? That's one way to put it.
The muzzle velocity differential from .308 to 30-06 is about 200fps with the same weight bullet...
Many people prefer that significant benefit...
The .300WinMag is about 200fps faster than the 30-06 with a slightly heavier bullet (Say a 165gr vs a 180gr)
Many people prefer that significant benefit...
It also depends on the animal you will hunt the most...
If you will be hunting elk... the .300WinMag is hard to beat...
Your second choice for elk would be the 30-06 and then the 30-06 SHORT (.308)
Remember the .22 short?
If you are exclusively deer hunting then all three are acceptible
except for the price of ammo... Be sure you choose the correct bullet type so as not to pencil-hole the animal or make a bloody mess of it...
Bullet construction is a whole 'nother subject...
The heavier the bullet and the lighter the rifle, the more the recoil... it is not the caliber, per se...
The
ONLY place you will ever notice the recoil is on the benchrest...
+1 on the proper fit of the rifle to your anatomy... but a proper recoil pad will render that moot. Get the
60 degree A-bolt, but choose a model with composite stock.
I recommend you get the 30-06... and use 130 grain bullets for deer, and 165 to 180 grain (premium grade) bullets for elk.