I find a lot of shooters tend to break down into two camps: .30 or 7. If one likes the .300 mag, he also likes the .30-06, .30-30 and .308 (and I own all of these calibers). One who favors the 7 mag also feels gooey about the .270, 7mm Weatherby, 7mm Mauser, and 7-08.
Want to point out that a 7mm Mag is flatter shooting than a 300 Win Mag. Plus at 500 yards, the 7mm Mag with a 170 grain bullet actually delivers more energy than a 300 Win Mag with a heavier bullet.
I will respectfully disagree with your assessment of the 7mm Rem Mag shooting flatter than the .300 Win Mag. The 7mmRUM will shoot flatter than the .300, not the standard 7mm Rem Mag. Knowing your rifle and its cold shot capabilities will offset any difference between the two, and make a huge difference in the number of clean first shot kills and a missed or wounded animal you now have to track.
I have a Winchester M70 Sporter in .300 WM, and topped it with an older model Redfield Lo Pro 3-9X40 (that came off my 7400 in .30-06), and my first choice of bullet is the Winchester Supreme CXP3, 180 gr. Failsafe, BC of .527 and 3000 fps at the muzzle. At 500 yards, the velocity is 2163 fps with 1868 ft. lbs. energy. Contrast this to the 7mm Rem Mag: BC of .512, MV 2950, MV @ 500 is 2099 fps with 1564 ft. lbs energy. 600 yards is the outside limit for either of these two calibers.
Each and every fall, I can knock a beer can off a fence post at 500 yards with the first shot. I've taken a lot of deer at 400 - 600 yards. The flight time and drop at 500 yards is the same: .6 seconds and -33.4 inches, zeroed at 250 yards. Its all in knowing your gun, and getting that first cold shot on target. :thumbup:
I'll bet anyone here I could get a 7mm to do the same, so I'm not knocking the caliber. It just takes time dialing in the scope and sticking with the same ammo once you're where you want to be. You can't keep pushing round after round at the target and thinking you are getting dialed in. Bullets produce heat, and after 3 or 4 successive shots, you going to be off. The first time I dial in any scope, its usually an all day affair. I like to wait at least 30 minutes between shots, to let the barrel cool back down. In the field, you don't always get a quick follow up shot, but you should have 1 clean first look.
Money no object, I'd take a 338 Lapua or a Weatherby 30-378.
