RE: 7mm Ultra Mag vs. the 300 Ultra Mag
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Actually it may surprise some to know that at 300 and 400 yards a 160 lauched at 3100 from a 7 Rem Mag will shoot flatter and have more energy than a 180 from a 300 Win Mag at launched at 3100.
My Barnes ballistics program shows the following.
.284" 160,BC of .468 at 3100fps muzzle vel, 200 yard vero
300 yards,Velocity:2491,Energy:2204,Trajectory:-6.17"
400 yards,V.......:2306.E.....:1889,Trajectory:-17.95"
.308" 180,BC of .410 at 3100fps muzzle vel, 200 yard zero
300 yards,Velocity:2411,Energy:2066,Trajectory:-6.42"
400 yards,V.......:2206,E.....:1728,Trajectory:-18.84"
Now....you could load a 200 gr bullet in the 300 with a similiar BC to the 160 gr 284" and launch it at 3100 from an Ultra Mag or possibly from a long barrelled 300 Weatherby and it will keep up with the 160 .284" bullet and maybe surpass it.The only tradeoff is recoil.This is why the 7mm Rem Mag is such a good all around cartridge for average shooters. It has the energy and trajectory and the recoil is hardly more than a 270 or 30-06.But...I still like my 300 Win better, I have both.
Problem is, it is quite difficult to launch a 160gr bullet from a 7mm Rem Mag at 3100fps. Realistically, you're looking at 2900fps from this cartridge with that bullet. The 7mm RUM, however, or even the 7mm Wby Mag, can do this with no problem. So can the .270 Wby Mag, and the .277 cal bullet, because of higher SD, hits with greater energy and a flatter trajectory than all the others.
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Good Dogwork and Good Hunting
Edited by - seattlesetters on 11/13/2002 01:10:39