As a teenager and into my 20’s I went from a 7rm to 300 wm to a 35 Whelen.
20 years later I hunt with a 270win and a 6.5 cm. I don’t think I got tougher, just smarter.
Nobody is going to shoot a light rifle in 300wm as well as a 270win at 400 yards. No matter how tough they are.
The reason for the success of the 6cm over the 6.5 in PRS is because even skilled shooters shoot better with less recoil.
