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Old 01-25-2008, 09:41 AM
Ron AKA Ron AKA is offline
 
Join Date: Jan 2008
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Quote:
Originally Posted by PoppaW View Post
Ron AKA, my comment on displacement refers to the bigger bore which will give you bigger bullets. And in this case the 7mm case is smaller so the reloader can get a lot more power from the 300 as the shoulder is farther forward than the 7mm.
Yes I understood what you were saying, but I do have to disagree that bore size is a big factor, and in fact I consider it a negative factor. Yes the 300 case is slightly longer, but it needs a bit extra powder because it has to use the less efficient larger diameter bullets. To get the same down range performace you have to burn more powder and endure more recoil. My view which is not popular with a few here, is that many hunters go out with a rifle that has too big a bore and too heavy a bullet.

In another thread I posted some cartridges that met the assumed need for 1750-1950 ft-lbs of energy at 300 yards. I sorted this short list with the flattest shooting cartridge first, and the poorest last. Here they are:

Cartridge, Bullet Wt, 300 yd vel, muzzle vel, 300 yd vel
7mm RM, 140, 2490, 3133, 1927
7mm RSAUM, 140, 2490, 3133, 1927
7mm STW, 140, 2467, 3436, 1892
280 Rem, 140, 2437, 2797, 1846
300 WM, 150, 2384, 3605, 1893
300 WSM, 150, 2364, 3671, 1861
300 RSAUM, 150, 2359, 3410, 1854
30-06, 150, 2298, 2820, 1758
35 Whelen, 250, 1823, 3197, 1844
375 H&H Mag, 270, 1780, 4338, 1900

Notice that this ends up being essentially in order of bore size and bullet size, with the big bores/heavy bullets the poorest. I also agree with the last couple of posts that the 300 is probably overkill and perhaps even the 7mm is as well. The advantage of the 7mm is that it can be more easily loaded down to more reasonable energy levels for smaller game. But it could be asked why even a 7mm, when the 270 is very good, and if one insists on going off the beaten track to get something different, then the 280 Remington. I also posted a second list of the more modest energy levels, sorted by the same criteria as the other list:

Cartridge, Bullet Wt, 300 Yd Vel, Muzzle Eng, 300 Yd Eng
270 WSM , 130, 2444, 3114, 1724
270 Win, 130, 2442, 2702, 1721
260 Rem, 120, 2334, 2392, 1560
264 WM, 140, 2326, 2854, 1682
7mm-08, 140, 2314, 2542, 1664
280 Rem, 140, 2309, 2797, 1657
300 RUM, 150, 2270, 2820, 1716
30-06, 150, 2270, 2820, 1716
308 Win., 150, 2219, 2648, 1640
7mm RM, 160, 2212, 2987, 1739
308 Win., 180, 1974, 2743, 1557
350 RM, 200, 1921, 3419, 1639


Ron
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