Good points coyote hunter. I'm checking the ballistics now. THe 270wsm 1-6 inches flatter (depending on range) and hits from 200-400 lbs harder... how much real difference is that? Is there a big difference or hardly any?
Braden --
Among the .270/7mm/.300 WSM loads, the .270WSM is the only one that seems to have a real velocity advantage over their counterpart. So, depending on the factory load selected, you are correct. (I was surprised at this, by the way, as the 7mm and .300 WSM struggle to keep up with the 7mm Rem Mag and .300WIN.)
Here's a comparison of Winchester .270 WSM and Federal WSM and WIN loads, all zeroed for Maximum Point Blank Range for a 6" diameter target:
Cartridge MFG Weight Bullet Velocity Zero/MPBR 300 400
Drop/FPE Drop/FPE
.270WSM WIN 140g Accubond 3200fps 269/316 -1.9/2130 -11.3/1850
.270WSM WIN 140g Failsafe 3125fps 258/303 -2.8/1806 -14.1/1499
.270WSM WIN 150g Power Point 3150fps 258/302 -2.9/1760 -14.3/1438
.270WSM FED 140g Accubond 3300fps 278/326 -1.3/2275 - 9.9/1980
.270WSM FED 140g Bear Claw 3200fps 265/311 -2.2/1955 -12.4/1644
.270WSM FED 150g Partition 3160fps 266/313 -2.1/2208 -11.9/1912
.270WIN FED 140g Accubond 2950fps 250/294 -3.5/1788 -15.3/1544
.270WIN FED 140g Bear Claw 3100fps 258/303 -2.8/1824 -14.0/1530
.270WIN FED 150g Partition 2950fps 243/285 -4.4/1765 -17.4/1517
After doing the calculations, I'm going to agree the fastest .270WSM loads have a healthy advantage over the fastest .270WIN loads in the energy, range and bullet drop departments. If I was going to choose one of the above loads to hunt with, however, my first choice would be the Federal Bear Claw loads. Comparing the WIN and WSM versions for this bullet, the difference isn't that great.
That said, there is at least one more option you might want to consider if velocity, flat-shooting and manageable recoil are the name of the game -- the 7mm Rem Mag. It will push a 140g bullet to 3340fps, a 150g bullet to 3248fps, a 160g to 3112fps, and a 175g to 2970fps (Nosler 5th data). And it will deliver these bullets on target with a flatter trajectory and more retained energy than the .270WSM loads in similar weights. On the lighter side, the 7mm Rem Mag will push a 120g to 3562fps (Nosler 5th again) and a 100g to 3709fps (Barnes #2 data). That beats anything the .270WSM can do in bullet weights from 100g to 160g. In fact, the only place I know of where the .270WSM has a velocity advantage over the 7mm Rem Mag is with a 90g Sierra bullet at 3789fps, and the advantage over the 100g 7mm Rem Mag load is marginal.
Although not a sexy new cartridge, my 7mm Rem Mag 160g Grand Slam load at 2852fps penetrated through a big 6x5 bull elk at 350 yards, which is about as far as I am comfortable shooting big game. The bullet delivered 1571fpe (see .270WIN loads above) and dropped him in his tracks. To answer your question about 200-400fpe additional energy -- I could have taken the same shot with a Nosler 160g Partition at 3112fps, delivering an additional 572fpe with 5" less bullet drop, but it would not have been any more effective. Learn to shoot first, which means practice, practice, practice!