Nothing so needs reforming as other people's habits - Mark Twain
Tact is the knack of making a point without making an enemy / Where is the wisdom we have lost in knowledge?
I shot my first deer with a Ruger #1 7mm RM when I was 15. My Dad kept bullet weight down to 139 grains or so, and the recoil did not bother me. Light bullets in the 7mm have better sectional densities than those of .30 with bullets in the 139 class, and velocity being squared in the energy equation makes the 7mm RM much more impressive. If I am going to shoot 170 or 180 grain bullets, I might as well shoot a .30 caliber rifle.
Handloader magazine can sell you reprints of Ken Waters' Pet Loads articles on any caliber you wish. I have most of them downstairs, and could scan those I have if you get a 7mm RM. Waters did a lot of experimenting and gave lots of insight. The other two sources I really like are old Lyman manuals, and Sierra manuals. I like them because they list a load which gives really good results in most rifles of that caliber with each bullet weight.
A 7mm RM wears out a barrel faster than a .30 caliber. These "overbore" cartridges tend to eat up barrel throats. You may be able to see it. You will certainly be able to feel it, if you run a patch down the barrel.
The above goes for bullets too.
When Hornady dropped the .30cal 208Gr AMAX and switched to the 208gr ELDm I reworked the load I had developed for my rifle. In the end, the powder charge was slightly different, and the CBTO measurement was different as well.
Working diligently to enlarge my group size.