A .300WM does what a 7mmRM does but with a heavier bullet and a step up in recoil.

I have a 300 wby, rum, and win mag as well as a 7mm mag. They will all do what you need, kill an animal. It all boils down to what you actually want. 7 mm will shoot flater, but unless you plan on being a sniper and shoot out past 1000 yrds, the difference is moot. Especially if you get to know your weapon.

Exactly. I went with the 7 mag, primarily to have that option if I needed to get some distance, and the recoil.

Does a 7mm Rem Mag really shoot any flatter than a 300 Win Mag? The 300 propels heavier bullets to the same speed, which, I would think, would make it a little flatter.

Depends on the bullets used and the BC on the bullets. Either one can be "flatter" depending on the boolits...

^This!..... Do any of these internet ballistic experts study ballistics?
its not the cartridge, its not the velocity, Its BC that rules at long range.
BC will outrun velocity every time beyond 600 yards.

Any 2 given bullets of the same BC drift and drop exactly the same regardless of weight or diameter....FACT!
RR

http://chuckhawks.com/myth_busting_calibers.htm

check this out

That's a bunch of malarkey!!!

Actually I feel dumber for even reading most of it!

means less than nothing, if you knew ballistics you would know why, my 6.5 gibbs burns less powder than the top 5 in the charts, yet it outperforms them because the bullet I shoot instead of having a BC in the .4's has a BC of .7, as far as wounded deer beyond 300, it happens, but speaking as a person who has killed 66 beyond 400 yards, dozens beyond 600, 10 beyond a grand, I know if you hit one, even if its not immediately fatal, not near as many are unrecovered simply due to the fact that there is no "in their face" muzzle blast, they are hurt and bed down, most of the time within 50 yards of impact, they are easily recovered. ok don't believe me, shoot a few at 600 and tell me about it.
learn what a bullet does from trigger break till impact and get back with me.
RR

Adam first mention of wounded deer and I bailed, been around the horn enough to know better
RR