There is really nothing wrong with the .270 Winchester. It was ahead of its time and offers trajectory virtually identical to many magnums with its 130-gr. bullet. It also has a bit less recoil than some of its bigger brothers, yet offers the same killing power as other popular big game rounds. So can it be improved just a bit?
Well... I think the .270 WSM is a little better .270 than the "real" .270. So far factory ammo chronographs at what it is supposed to and that is not the case with the original that seems to have been downloaded a bit from original pressure specs. So it is faster, harder-hitting and a bit flatter shooting. The short-fat non-belted case is a nice design as well, and it, along with the .300 WSM, is the most popular short magnum and offered in the most rifles. Recoil is the lightest of any
listed magnum, especially lighter than the 7mm Rem Mag, yet performance is virtually identical. I think Jack O'Conner would approve of the new .270 even though there are no flies on the original 270 (
one that I still own as well). The .270 WSM just seemed to be a winner out of the starting gate just like its .300 WSM parent.
I have had no feeding issues with my original Win. Model 70 Classic .270 WSM and the .270 WSM is available in other good rifles as well, including the Rem 700 series. Even semi-custom rifles like the Kimber chamber it. Popularity seems to be very good ensuring ammo and component availability.
I also feel that with the superior design of today's
premium construction "boutique" bullets that there is no abiding reason to think that with bullets of such similar weights, diameters and sectional densities and velocity range that bullets heavier than 150 in .277" are really necessary or give up any performance to the .284" brothers.
So if you like the .270 Winchester, yet would like to have a little more "magnum" performance like some of the other popular rounds offered - here is your chance with the .270 WSM.
The 7mm Remington Mag suffers from the very wide chamber variations of different rifle makers and makes the ammo makers very conservative with pressure. Or good pressure with one rifle and load may be only .280 performance in another 7mm Mag. I have seen this one personally in my gun. Check out about 4 or 5 reloading manuals and try to determine a max load that is consistent. Most 7mm Mag guys I know do everything with a 150 or 160, so bullet range is moot.
As a reloader I hate belts for short case life that often entails because of huge chamber and headspacing variations around, especially in this caliber. When it headspaces on the belt - why bother with a tight, uniform spec chamber? - is evidently the thought.
If pure faith in the Magnum name makes the round perform ballistic magic, there is not a more believing crowd than 7mm Rem Magnum
aficionados.
The 7mm Short Mags don't suffer from the above chambering issues and pressures and performance are consistent so I believe it is a better 7mm Mag than the original but not very popular and not chambered in nearly as many rifles as the virtually identical performing .270 WSM.
This is one caliber that I would worry about availability and continued existence. Remington has their own struggling 7mm short mag and won't chamber the Winchester version. Most other outfits sit it out and just chamber the similar performing .270 WSM because it is proven to be popular.
As always, it is hard to go wrong with any of the listed calibers, but I do have some prejudices just like the next guy...
