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Developed by Winchester in 1959, the.22 Winchester Magnum Rimfire (WMR) was a potent cartridge that was soon produced by Smith & Wesson and Ruger. Winchester produced their Model 61 rifle for the.22 WMR beginning in 1960, while Savage introduced its famous Model 24 – a combination rifle for.22 WMR and.410 in an over-under configuration
The.22 Winchester Magnum Rimfire, also called.22 WMR, .22 Magnum, .22 WMRF, .22 MRF, or.22 Mag, is a rimfire cartridge. Originally loaded with a bullet we…Wikipedia
The .22 Winchester Magnum Rimfire (WMR) came into being in 1959. Winchester’s first rifle for the new cartridge was their slide-action Model 61, and it wasn’t brought out until 1960.
The 22 WMR muzzle velocity has a lot to do with the weight of the bullet measured in grains, which is why we see hyper velocity bullets weighing in at 30 gr -32 gr.
Winchester developed Super-X 22 WIN MAG Rimfire Ammo as serious hunting ammunition intended for small game, varmint, and predator hunting as well as power plinking at extended range.
It first appeared in the Marlin Model 57M Levermatic carbine in 1959, which was followed by the .22 WMR over .410 gauge Savage Model 24 combination gun, followed by Winchester’s own Model 61 and 275 pump-action rifles and Model 255 lever-action rifle. The Chiappa Double Badger combination gun also comes with a .22 WMR over .410 gauge option. The Springfield Armory M6 Scout is also made in .22 Magnum over .410 gauge. The Chiappa M6 Survival Gun is similar combination gun that comes with a 12 gauge or 20 gauge shotgun barrel over a .22 Magnum barrel.

A number of single-shot and repeating rifles were offered in .22 WMR. The .22 WMR operates at pressures beyond what normal blowback actions typically handle, but the self-loading Jefferson Model 159 was introduced for the cartridge. Until the 1990s, most .22 WMR firearms were bolt-action rifles. In 1977-1985 Harrington & Richardson produced the first American-made semi-automatic .22 WMR. In the 1990s semi-automatic .22 WMR rifles were also introduced by Ruger (10/22) and Marlin, and are currently produced by Remington (Model 597) and Tanfoglio Appeal Rifle as well as the Excel Arms Accelerator Rifle and Savage arms A22 magnum.

Revolvers in .22 WMR are made by Smith & Wesson, Colt, Taurus, North American Arms, Heritage Arms, and Sturm Ruger. Semi-automatic pistols for this cartridge are (or were) produced by Kel-Tec, Grendel and AMT, the latter two now defunct (AMT has been since resurrected by High Standard). The Grendel, AMT and Kel-Tec designs used specially designed chambers with flutes or gas ports, designed to lubricate the long, thin cartridge with gases from the chamber, overcoming the Blish effect and allowing easy extraction of the cartridge. High-Standard produced various models and versions of their classic two-shot over/under derringer in both .22 WMR and .22 LR.

The Marlin Model 25MG is a smooth bore, eight-shot, magazine-fed, .22 WMR, bolt-action shotgun manufactured by Marlin firearms Company. It was specifically designed to use snake shot, and marketed as a “garden gun” for use in dispatching small garden and farm pests. It has an effective range of about 15 yards when using snake shot. Based on earlier Marlin .22 caliber designs, the garden gun was equipped with a high-visibility front sight but no rear sight.

The Argentine EDDA submachine gun uses the .22 WMR round.

In 2014 Kel-Tec released the CMR-30, a PDW-style rifle chambered in 22. WMR with a 16″ barrel and a 1:14 twist rate. It uses the same double stack 30-round magazine as the PMR-30.

In 2018 Standard Manufacturing introduced an 8-round .22 WMR revolver at the Las Vegas Shot Show. The revolver was originally introduced as the Volleyfire. The gun has side-by-side barrels, and fires 2 rounds of .22 WMR (1 bullet per barrel) with every pull of the trigger. In 2019 the gun went into production and was renamed “Thunderstruck”.

In recent years, a few UK companies such as Guncraft Ltd have been making semi-automatic AR-15-style rifles chambered in 22 WMR, marketed to civilian shooters who, due to the UK’s tight gun laws, do not have access to self-loading center-fire rifles.

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