7mm Winchester Short Magnum History and General Information.  The 7mm WSM is a new centerfire rifle cartridge developed in partnership with Browning Arms Company and Winchester ammunition, making its debut and introduced to the shooting public in 2001.  The 7mm WSM is a commercial cartridge based on the 404 jeffery cartridge case, shortening to 2.100" and necking down to .28 caliber and sharpening the shoulder angle to 35 degrees the new 7mm WSM cartridge offers plenty of case capacity for tailored handloads.  The 7mm WSM cartridge achieves its useful purpose as an excellent cartridge for larger, mule deer, sheep, black bear and elk, 28 caliber is a time proven caliber for elk, deer size game animals.  The 7mm WSM cartridge is a well thought out cartridge as Winchester is no stranger in 28 caliber cartridge development. Winchester has now developed 2 cartridges in this caliber;  (284 Winchester in 1963), and  (7mm Winchester Short Magnum in 2001).  The 7mm WSM factory loadings show a velocity of 3,225 feet per second for a 140 grain bullet for deer and sheep hunting and this translates to moderate recoil for the shooter with plenty of bullet energy at the 500 yard mark to flatten a larger deer size animal.  The 7mm WSM cartridge, chambered in a short actioned light weight rifle may well be the ultimate combination for a superb mountain rifle that offers a slight increase in bullet frontal mass and energy offered by the 270 WSM in rugged terrain. 7mm WSM Barrel Specifications. Common Barrel Twist Rate - 1 in 9 1/2". Bore Groove Diameter - .284" 7mm WSM Reloading Specifications. Bullet Diameter - .284" Maximum Case Length - 2.100" Trimmed Case Length - 2.090" Primer Size - Large Rifle 7mm WSM Loading Data Hints.  The 7mm WSM cartridge responds well to IMR 4831 powder delivering high velocities with excellent accuracy with 140 grain bullet weights. 7mm WSM Reloading Data. Hodgdon Reloading Data Center. 7mm WSM Reloading Dies. RCBS Full Length Die Set, 7mm WSM. 7mm WSM Shell Holder. RCBS #43 Shell Holder For 7mm WSM. 7mm WSM Bullets. .284 (diameter) Bullets, by Sierra, Hornady, Nosler. 7mm WSM Unprimed Brass. Winchester Bulk Unprimed Rifle Shellcases, 7mm WSM. 7mm WSM Ammunition. Winchester, 7mm WSM ammunition. 7mm WSM Rifles. New Browning, Winchester, 7mm WSM rifles here. 7mm WSM Trajectory and Hunting Applications.  This is a down range trajectory chart for the 7mm WSM cartridge with the scope mounted 1.5 inches above the bore center line plus if you were using this load, its effective hunting bullet energy range with well placed shots on, Deer size game, such as Antelope, Blacktail, Hogs, Javelina, Mule, Whitetail. Elk size game, such as Caribou, Black Bear, Sheep. Bullet diameter .284" Bullet weight 140 grains Bullet ballistic coeffecient .460 Bullet velocity 3,225 feet per second Range 100 yds. 200 yds. 300 yds. 400 yds. 500 yds. + + 1.2 0 - 5.6 - 16.4 - 33.1 2812 2438 2106 1812 1550  Deer + + + + + -  Elk + + + - - - Copyright 2001 - 2007