In an M70, I go with the 7mm because the shorter case gives me more room in the box to play with OAL. A full length action like a 700, and I’d consider the 300.
I have never had a model 70 that I left the mag box spacer in.
Doesn’t that require having to modify the ejector and bolt stop? Seems like a lot of effort vs buying a 7mm Rem Mag or an M700.
Yes, a bolt stop, H&H length mag and a H&H, RUM, etc ejector. It’s usually about 50 bucks worth of parts to get 3.6” out of the magazine.
