There's an old traditional way of sighting in a big game rifle called MPBR or Maximum Point Blank Range. Usually it's expressed with a number, like ±3" MPBR.
What it means is this: if you sight in the rifle so the bullet never goes more than 3" above or 3" below the point of aim, how far can you shoot without holding over the target?
The premise is that you don't need more than ±3" accuracy to shoot a deer, and chances are you can't shoot any more accurately than that in the field anyway. So why not sight in the rifle so that you don't have to worry about the trajectory? Just aim and shoot.
What you find is that the ±3" MPBR for spitzer rifle rounds ranges from a bit over 260 yards for the ancient 7x57 Mauser all the way up to 322 yards for the ultra-fast, super-flat-shooting, expensive .240 Weatherby Magnum. The .270 and 7mm Rem Mag come in just above 300 yards; the .308 drops you all the way back to 285 -- just 20 yards different!
What does that mean? It means that there's not a helluva lot of difference between a flat-shooting round and a not-flat-shooting round
.
Furthermore, in the field I can't accurately eyeball the difference between 285 and 305 yards, and if I have the time to use a rangefinder, I can adjust for bullet drop anyway.
If you're hunting at 200 yards or less, there's no difference, regardless. Even the 150 grain Wal-Mart special .30-30 has a ±3" MPBR comfortably over 200 yards, to say nothing of the new Hornady stuff.
Look for yourself:
http://www.chuckhawks.com/rifle_trajectory_table.htm
Go here:
http://www.chuckhawks.com/index2d.rifles.htm and scroll down to Tables, Charts and Lists. Chuck Hawks may piss some people off (like any gun writer in every medium), but his compilation of numbers here is really useful and will help you understand what you're really looking at (and paying for). He also has a table of recoil. That, too, matters. For hunting deer at under 200 yards, I'd be much more interested in a light, low-recoil rifle like a 7mm-08, or a generic easy-to-find round like .308, than some heavy, expensive and fatiguing Magnum.