In 1925 Winchester necked down the .30-03 to .277 and created the .270 Win., a sporting cartridge designed for medium-size game that shot flatter yet recoiled less than the .30-06 Springfield. First, the .270 Winchester is significantly longer. LMAO. Note: these are not the only broad categories of rifle actions. However, Winchester made a big splash with the .300 Winchester Short Magnum in 2001 and followed up with the .270 Winchester Short Magnum and 7mm Winchester Short Magnum cartridges in 2002. They’re both outstanding cartridges and I’d say that the 300 WSM is the best designed out of the Winchester Short Magnum line. Both will work exceptionally well on game ranging from whitetail, mule, and fallow deer all the way up to elk and moose out to several hundred yards. If you’re using the two cartridges at ranges less than a quarter-mile, the trajectory difference is negligible, but the .270 WSM does have the advantage of utilizing a shorter action than the .270 Win. The same goes for guns: rifles chambered in 7mm Remington Magnum are extremely popular and very commonly in the United States. loads are typically a few cents cheaper per shot. The Hornady .300 Win Mag shoots a little bit flatter due to its faster muzzle velocity, but the difference between them is so small that it’s probably not even worth considering. The .25-06 Rem. Many of the most popular centerfire rifle cartridges in the United States, like the .270 Winchester and .30-06 Springfield (both of which have an overall length 3.34″), require the use of what is commonly referred to as a “standard action” or “long-action” rifle. If you prefer a shorter, potentially lighter rifle, that’s slightly faster cycling and easier to carry, but still has magnum performance, then go with the 300 WSM. Both cartridges are also well suited for hand loaders and reloading components for the .300 Win Mag and 300 WSM are widely available. Absolutely. On paper, the Winchester Short Magnums are very closely matched with their standard length cousins. In fact, the difference in published velocity is often smaller for the 300 WSM vs 300 Win Mag than the 7mm WSM and 7mm Rem Mag. Second, both cartridges use the same .277″ diameter bullets. However, both the 7mm Remington Magnum and 7mm Winchester Short Magnum cartridges are capable of excellent accuracy in the right hands and will get the job done under most circumstances if the shooter is up to the task. Like I mentioned a minute ago, that particular 325 WSM load above has essentially the same trajectory and still has about 95% of the kinetic energy of that .338 Win Mag load. The 300 WSM and 325 WSM also have the benefit of doing all of the above with a modest decrease in recoil compared to the .300 Win Mag and .338 Win Mag while the 270 WSM offers a definite improvement in velocity over the .270 Winchester. I'm struggling with the same issue. This means that it’s possible to build a short action rifle that’s a tiny bit shorter and lighter than an otherwise identical rifle with a standard length action. At the same time, the 300 WSM is the most popular Winchester Short Magnum cartridge and is also extremely commonly used as well. Indeed, the 6.5 Remington Magnum, the .350 Remington Magnum, and the line of proprietary Lazzeroni cartridges all came on the scene before the WSM line, but none really caught fire for various reasons. Those factors result in this particular 300 WSM load having about 7% less free recoil than the .300 Win Mag. As you can see, since the loads for each cartridge used the exact same bullet and since the 270 WSM had a slight advantage (about 200-300 fps) in velocity it has a slightly flatter trajectory than the .270 Winchester that’s nearly on par with the .270 Weatherby (270 Wby). 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