(Figures from
www.shootingtimes.com/ballistics/ballistic-tables/)
Let’s use the .30-30 as a baseline, in that it has been reliably putting down whitetails at 100 yards for the past century. A standard .30-30 load with a 150gr SP bullet has a KE at 100 yards of 1,356 ft/lb, so let’s take that figure as the required energy. (I will stay away from black bear and moose for now, even though the .30-30 has taken more of those than virtually any other calibres outside of the .303 or the .30-06. Let’s just stay with deer.)
The .270 Winchester 130 gr SP has that KE at 400 yards – 1,379 ft/lb. It’s reasonable to conclude that the .270 Winchester can be expected to do what is required of a deer rifle at any distance up to 400 yards.
The .270 WSM with a 130 gr SP has 1,380 ft/lb at 500 yards – that’s clearly superior to the .270 Winchester. There’s no doubt about it – the .270 WSM has superior energy at all ranges. Indeed, it provides the same energy at 500 yards that our reliable .30-30 benchmark provides at one-fifth that distance. Remarkable design.
There’s only one problem with all of that. How many of us – honestly, now – can hit a deer’s vital zone at 500 yards every time, first shot? (Keep in mind that the drop at 500 yards is 33 inches and the vital zone is no more than a foot square.) Unless you can put your first round into that size target every single time, shooting at that distance is irresponsible because you’re too likely to just wound.
So we have an excellent round, one that would frankly seem to have more potential than most people can take advantage of. Its excellent velocity is commendable, but you can only kill game dead – ‘dead-dead-dead’ may be impressive, but it’s no closer to the pot than simply ‘dead’.
If you like to be seen carrying some cordite-powered arm-candy, go for it. There’s absolutely nothing wrong with paying a few extra pesos to have that kind of velocity. Freedom of choice is grand - fill yer boots, boys. But let’s just not kid ourselves that it brings some practical advantage over the .270 Winchester.