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The A-Bolt rifle is a bolt-action rifle with a short-lift bolt angle of 60 degrees. It uses a non-rotating bolt sleeve (partial sleeve on first generation A-bolt rifles). When the bolt is unlocked, smoothness is achieved with three guide ribs aligned with three locking lugs, enabling precise movement (only on the second and third generation A ...
The .300 WSM also head-spaces off of the case shoulder, versus the older .300 Winchester Magnum's belted head space design. The advantage to this round is the ballistic performance is nearly identical to the .300 Winchester Magnum [ 2 ] in a lighter rifle with a shorter action burning 8 - 10% less gunpowder.
WSM and WSSM family of cartridges. From left to right: .223 WSSM, .243 WSSM, .25 WSSM, .270 WSM, 7 mm WSM, .300 WSM, .325 WSM. Winchester Super Short Magnum, or WSSM is a line of rebated bottlenecked centerfire short magnum cartridges introduced by the U.S. Repeating Arms Company (Winchester Inc). [1]
The 300 WSM was the first of the new class of short magnums to see wide use. All of the WSM cartridges released to date have proven popular for thin-skinned game up to the size of elk and African plains game, the .325 WSM being an excellent cartridge for elk, bison and similar big game. The cartridges in this family are, in order of development:
.270 WSM.270 Weatherby Magnum.280 Remington 7mm Mauser 7mm-08 7 mm Remington Magnum 7mm WSM 7mm STW.300 Savage.30-06 Springfield.308 Winchester.300 H&H Magnum.300 Winchester Magnum.300 WSM.300 Weatherby Magnum.300 RUM.325 WSM.338 Winchester Magnum.35 Remington.358 Winchester.375 H&H Magnum.416 Remington Magnum.416 Rigby.458 Winchester Magnum
The .325 WSM uses the .300 WSM case necked up to accept the 8mm bullet. The cartridge was influenced by the .404 Jeffery and contemporary cartridge designs calling for a short, fat cartridge operating at high pressures which could be cycled through a short action rifle. [4]
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The Winchester made Model 70 in .223 WSSM has not been revived in the new Browning-made Winchester Model 70s, but Browning has chosen to use chrome-lined barrels on all of its guns chambered for .223 WSSM and has introduced the .223 WSSM cartridge as a chambering in its A-bolt rifles. Browning rejects the charge that the .223 WSSM round is ...