While recoil energy determines how hard the blow to the shoulder feels, recoil velocity determines how abrupt the blow to the shoulder feels. Well Holy Moses. As with most of the 7mm heavies, the 7 SAUM is very efficient in the wind. I then fire-form those prepped cases. The Lyman 50th Edition (p197-198, 199-200, 214-216, 219-220,257-259, 260-262, 288-289, 294-295) and Hornady 10th Edition (p351-359, 356-359, 406-411, 412-416, 564-573, 574-585, 637-639, 659-664) reloading manuals were used as references for the history of the cartridges. I don't have any "special" secret loading techniques. For match shooting, the 7mm-08 doesn't really have the boiler room to push the heavy 175-180gr bullets efficiently, so we suggest that paper-punchers concentrate on the 150-160gr class. However, to achieve its small velocity advantage, the larger 7mm WSM had to burn 7-10% more powder than the 7mm SAUM. On the front of the barrel is Browning's patented BOSS system. The .300 Winchester Magnum is extremely popular and is consistently among the Top 10 best selling rifle cartridges in the United States each year. For all intents and purposes, there is no difference between them ballistically and both cartridges will really do a number on most species of big game. I've found no need to weigh, trim meplats or sort by bearing surface length. Felt recoil will vary from shooter to shooter and rifle to rifle, but free recoil energy is still a useful way to compare cartridges. Of these, 140 grain, 150 grain, 160 grain, and 175 grain loads are by far the most common. For this reason, while they will do the job on deer sized game, the 325 WSM and .338 Win Mag are both excellent choices for larger game like caribou, elk, moose, red stag, kudu, and eland. That’s not meant to be a knock on the Winchester Short Magnum line either. Q: Your 7 WSM has logged 10-shot groups at 1000 yards that could win many 1K benchrest matches. With any brand of brass to be used in a .284 Win, you'll need to inspect the brass, and prep the cases. In warmer weather, he figures 3030-3050 fps with 180s is the MAX, and that is probably going to prove more accurate than 3100 fps. This is one of the tougher aspects of using the 325 WSM: there’s not a gigantic variety of factory ammo or a large number of bullet choices for hand loaders to choose from. The .300 Win Mag is a bit more widely adopted, but you probably won’t have any issues finding a nice rifle chambered in 300 WSM either. At about $42.00/100 it is less than half the cost of Norma brass. While virtually every big ammo manufacturer produces factory hunting ammo for the .338 Win Mag, only Nosler and Winchester Ammunition currently produce 325 WSM hunting ammo as part of their Trophy Grade, Expedition Big Game, Power Max Bonded, and Super X lines (loaded with the AccuBond, E-Tip, AccuBond CT, Bonded Rapid Expansion Hollow Point, and Power-Point bullet respectively), For those reasons, most sporting goods stores usually carry ammunition for the .338 Win Mag, but 325 WSM ammo can be significantly harder to find. With Rem-brand 7mm SAUM brass, after full BR prep, I find that each lot splits almost evenly into two weight groups separated by about two (2) grains. Is it significantly more accurate than the .338 Winchester Magnum? Among the short action magnums, most interest has focused on the 7mm WSM (and 300 WSM necked down to 7mm) until very recently. So, while the 7mm WSM is faster on paper, the two cartridges have essentially the same velocity for all intents and purposes. But velocity was much higher. in a package almost as small as the .260 Rem. While there is a big overlap in bullet weights the 325 WSM and .338 Win Mag can use (both cartridges are commonly loaded with bullets in the 180 grain to 250 grain range), the .338 Win Mag generally leans a little heavier than the 325 WSM. Your write ups always offer very practical and useful information. While hunters can be overwhelmed by the variety of good 7mm bullets available, long-range match shooters can concentrate on a half-dozen superior designs in the 160gr and up range. Remington makes SAUM brass, and I've heard that it can be quite consistent if the necks are turned and you're willing to weight sort the brass. These figures remain practical maximums for the modern hunter. That’s a pretty major step down in recoil, especially when you take into account that you’re getting almost the same amount of performance out to 200-300 yards. For example, so called “magnum actions” are even longer than standard actions. They’re both great cartridges, but I’d probably lean towards the .270 Winchester. Once again, the 270 WSM has a slight advantage over the .270 Winchester in this area. Winchester Model 70 Post 64 Factory Walnut Rifle Stock W/ Recoil Pad 7MM WSM: Condition: Used. WSM vs. SAUM -- Key Considerations The 270 WSM is relatively popular itself (probably the second most popular Winchester Short Magnum cartridge behind the 300 WSM), but it can’t hold a candle to the .270 Winchester in terms of overall availability. The 7 WSM offers a flatter trajectory and the high-BC bullets carry energy out to long range really well. Hodgdon Max load, 2.825" COAL. In order to obtain that performance from a .30 caliber, I would need to jump into the .300 Win. Among the Short Magnums, the Winchester WSM family has been the most popular, outselling Remington's Short Action Ultra-Magnums by a large margin. That's why he's able to shoot 1000 yards right in his "backyard". Versatile, Accurate Round Ideal for Hunting and Metallic Silhouette Both cartridges are also well suited for hand loaders and reloading components for the 7mm Remington Magnum and 7mm Winchester Short Magnum are widely available. Strong, Modern Case That Can Drive Big Bullets at 3000+ fps. Today there is great interest in the .284 Win. Now that we’ve covered the basic history and design of the Winchester Short Magnum cartridges, let’s see how they compare to the .270 Winchester, 7mm Remington Magnum, 300 Winchester Magnum, and .338 Winchester Magnum. I use the handy Angle-Cosine Indicator (ACI) from SniperTools.com for up or down shot-angle correction. The average difference in the case capacity is 3.35 grains in favor of the 284 Shehane. Bryan, an air-to-air missile design engineer for the US Air Force, also runs a consulting business,'Applied Ballistics, LLC', that provides ballistics testing, software development, and bullet design analysis. I see that Beretta and Savage is still making a 270 wsm and a 300 wsm but I'm really a 7mm mag fan. Some shooters have experimented with a "high node", up past 3150 fps, but this runs the risk of bullet blow-ups. The other "Achilles heel" of the Short Mags is barrel life. I never shot a 1K group with Steve's gun, but at other distances, including 500 yards, it has performed identically to mine. With this in mind, designers at Winchester Repeating Arms elected to build a line of cartridges that could fit in a short length action with the goal of achieving similar performance to popular standard length cartridges. Ease of Load Tuning But, even though the 300 Winchester Magnum does have a belted case (which the 300 WSM lacks), the 300 Win Mag generally has a reputation for pretty reliable feeding in most rifles. If necessary, run the necked-down Norma brass through a conventional 7mm SAUM full-length sizing die. 2900 in 24" bbl. The first two shots went 3126 and 3118--with a blown primer on the first and a smoked primer on the second. Two years ago I decided that some type of 7mm was the ticket for doing well at 1000-yard matches, especially if one could drive the high-BC bullets at 2900+ fps. All the metal is Teflon-coated in Mil-Spec OD Green. Necks are on average about .001 out of round so I turn them just enough to clean them up. Just like with the 270 WSM, this is due to the very large diameter of the 7mm WSM cases that simply take up more space in a rifle magazine than the thinner 7mm Rem Mag case. Both rifles in this case also have a 3 round magazine, so there’s no advantage there with either cartridge. It’s just that it doesn’t offer a significant improvement in power over the 325 WSM at close range, but still has more recoil. Thinning them can make neck-tension more consistent and reduce ES and SD. Given this kind of chamber (and the case's shallow 20° shoulder angle), the brass can build-up at the base of the necks (on both the inside and outside). The 270 WSM and 325 WSM are more of a mixed bag, but offer advantages to hunters in certain aspects as well and this is reflected in their popularity in particular segments of the hunting community as a whole. Another 50 or even 100 fps will not get me to switch unless I can get the same accuracy in all conditions.". With that in mind, the 325 WSM is a better choice for situations where very large and tough game like sambar deer or moose are likely to be encountered at close range. (SAUM). This gives you greater flexibility in bullet seating. The .30 caliber is capable of launching heavier bullets at higher speeds, but few people can honestly withstand that kind of recoil. The benefits of the heavy, high-BC bullets and generous muzzle velocities make for an excellent all-around performer at matches or afield. For game hunters, the choice of great bullet designs in 7mm (.284 caliber) is rivaled only by the wealth of 30-caliber bullets, and the 7mms enjoy a ballistic advantage, grain for grain, over the larger-diameter 30s. The modern “magnum era” began in earnest with the introduction of the 7mm Remington Magnum and .300 Winchester Magnum cartridges during the 1960s. It looks like a 6.5x47 Lapua on steroids. You can often find used BAR Safaris for $650.00 or less in superb condition. Proponents of the WSM cartridges also argue that this results in a shorter and wider powder column that’s more quickly ignited by the primer and burns more evenly than a comparable amount of powder in a longer and more narrow column. Do not forget that rifle weight is a crucial factor in the recoil equation, inversely proportional to recoil. This 7 WSM is the sixth rifle he's built for me--and they've all been tack-drivers. Going to town means a 50-mile trip. The 7mm SAUM is an ideal cartridge for long-range competition and long-range hunting. MSRP is $1237.00 (without scope), but typical retail price, brand new, is $900-$1000.00. However, don’t underestimate the importance of the greater variety, wider availability, and lower overall cost of .270 Winchester rifles and ammunition. Ended: Sep 29, 2020. We comparison-tested a 6.5-284 rifle launching 142 SMKs at 2975 fps, a 300 WSM rifle firing 210 Bergers at 2850 fps, and my .284 Winchester shooting 180 Bergers at 2900 fps. A .284 Win is the biggest cartridge you really need to hunt all but the largest North American game. For those reasons, the .300 Win Mag actually has significantly more case capacity (around 10-15% more, depending on the manufacturer) than the 300 WSM. 2. Right now, most accuracy-oriented .284 shooters are using necked-up Lapua 6.5-284 brass. In other words a 168-grainer fired from a 7mm-08 will exhibit less drop and less windage than a 168gr bullet fired from a .308 Win. The 1929 edition of the same textbook stated, in addition, that recoil velocity should not exceed 15 fps; above that velocity a gun-headache was very likely to occur. To match the ballistics of a 7mm 180gr VLD with a 30-caliber bullet, you must move up dramatically in bullet weight--to a 210gr or larger bullet. I had no desire to play the neck-down game with .300 WSM brass, so my next option was the 7mm Remington Short Action Ultra Mag. Anyway, here's the story of the 7 WSM that shot half-MOA at 1000 yards off a bipod. 7mm SAUM Part Deux -- New Gun Does Well 30" bbl. This is because CCIs have harder cups than other brands and can stand higher pressure loads before they crater. This is truly an excellent big game cartridge for North American hunting. Both cartridges are also well suited for hand loaders and reloading components for the .300 Win Mag and 300 WSM are widely available. 30" bbl. Winchester-brand brass is an excellent "second choice" and some good shooters prefer it to necked-up Lapua or Norma 6.5-284 brass.