How do they compare as far as range, acuracy, and knockdown?

are you talking 7mm rem mag, 7mm wsm, 7x57 mauser, 7x64 brenneke, .280 rem........? lot's of differences in ballistics in that lot

many 7mm's out there. which one do you mean?

My bad... 7mm rem. mag.

The 7mm mag carries more power, more range, more KICK, and more PRICE on ammo. But there is something about the .308 that is amazingly accurate and a deer killing machine.

There is NO comparison in ballistics between the two. The 308 will kill a deer just as dead, but there isno question the 7mm Rem is a superior cartridge. I used to be stuck on the 30-06, itis agood deer caliber and has a wide range of bullet weights to choose from. The 7mm Rem Magis a better caliber that offers a lot of bullet weights and types. My 7mm Rem Mag has less recoil than my 30-06, but it has a bull barrel so it is also heavier. The 7mm Rem mag cartridge like the 308 and 30-06is widely available. The cost of 7MM Ultra Mag ammo, which is a really hot round is costly. The 7mm STW is getting harder to find on the shelf at many sporting goods stores.I really like my 7mm Remmag.

Unless you're taking shots beyond 300 yards, I'd stick with the .308.

BINGO !

I say 308 win vs 7mm rem mag is apples vs oranges. Both will kill deer dead. I've heard rumor of 7mm blowing through deer at close ranges. I don't know for a fact that this has happened but I do agree with ipscshooter.

I would go with the 7mm Rem. Mag. Good luxk.