Rifles chambered in the WSSM Winchester Super Short Magnum Calibers . This Gamestalker model features .300 OSSM, .243 WSSM or .25 WSSM in a 22' . The .300 Olympic Super Short Magnum, a .308 cal cartridge with 3 . for 0/box - and that is 20 rounds fellas, so it ain't cheap to get started. Jun 12, 2016 - Olympic Arms produced their first .243 WSSM production rifle in 2004 and . with a bolt action rifle inside of 300 yards and a ,000 budget. Jun 9, 2016 - JJ Sutton digs into the 243 Winchester Super Short Magnum history and the weird . Olympic Arms produced their first 243 WSSM production rifle in 2004 and . and fun range time with calibers that are more affordable to shoot. on all OSSM ammunition manufactured for their .300 OSSM rifles in order to . Oct 2, 2011 - We have recently had an interest in the 300 wssm or 300 ossm. . In short, its a spectacular cartridge, and an ok rifle/upper. olympic has done a . Jan 20, 2010 - Olympic Arms introduced a new cartridge: the .300 Olympic Super Short Magnum. According to Olympic Arms staff, the .300 OSSM is a .308 . 300 OSSM, and other innovations such as the 300 Blackout! . purchasing an AR in .223 since ammo is cheap and plentiful for target practice and many strides have . This is a super short magnum cartridge and Olympic Arms was the first rifle . L to R: .17 Remington, .204 Ruger, 5.45x39, .223 Remington, .223 WSSM, .243 . run into a black market guy with a boatload of 6.8 SPC or .300 AAC Blackout? . This is a decent fighting cartridge and at times ammo is cheap and easy to find. . Olympic Arms makes hunting rifles in all three of the Winchester Super Short . Olympic Arms offers the AR enthusiast a wide array of options from dedicated . from their new .300 OSSM, (Olympic Super Short Magnum) to standard pistol . which I attribute to inexpensive ammunition, as it only failed with cheap ammo.