What he says might be true. But like my boss once said in the machine shop. That isn't hard. - This is hard! He was refering to T1 Tool Steel.
I thought that it was hard and it was. But there is Stainless Steel Alloys that are even harder. Like a 48 - 52 Rockwell C
The .338 Winchester Mag doesn't kick that much. I had a .300 Weatherby Mag built on a 1917 Enfield that kicked pretty good. As a matter of a fact, I had a pretty good Weaver Scope that I mounted on it because I couldn't sight it in. Within 3 shots the lense broke in the eye piece.
I used a Weaver Base - which I believe was Aluminum, since most of them are. The Leupold style bases are a very good choice. Most good gunsmiths I know lap the bases after mounting on the gun. The run out in the bases are a mininum, but even just skuffing helps retain the scope in the mounts.
I also sometimes use a small piece of sand paper - 1000 - 1500 grit inside the rings to help hold the scope in place. Loctite also helps for people that do not want to use sand paper.
I have a Redfield Mount on one of my .270's and it has never moved in 10 years of hunting. But then again - I take pretty good care of my firearms and never drop them or lug them around in the back of a pick up truck like some people.
Here is a good article for you to read.