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  2. List of rimfire cartridges - Wikipedia

    en.wikipedia.org/wiki/List_of_rimfire_cartridges

    Below is a list of rimfire cartridges (RF), ordered by caliber, small to large. Rimfire ammunition is a type of metallic cartridge whose primer is located within a hollow circumferential rim protruding from the base of its casing. The most common rimfire cartridges are chambered for .17 caliber and .22 caliber. The bullet diameter for .17 ...

  3. Benchrest shooting - Wikipedia

    en.wikipedia.org/wiki/Benchrest_shooting

    Matches are shot from 46 metres (50 yd) with rimfire rifles, up to 910 metres (1,000 yd) for centerfire rifles. In competitive group shooting at 91–274 metres (100–300 yd), shots often land very close together making only one ragged hole in the target, therefore a method for verifying the required number of shots (five or ten) is used.

  4. Rimfire ammunition - Wikipedia

    en.wikipedia.org/wiki/Rimfire_ammunition

    Comparison of centerfire and rimfire ignition Fired rimfire (left) and centerfire cartridges. A rimfire firing pin produces a notch at the edge of the case; a centerfire pin produces a depression in the center of the primer. Rimfire ammunition is so named because the firing pin strikes and crushes the base's rim to ignite the primer. The rim of ...

  5. Winchester Model 121 - Wikipedia

    en.wikipedia.org/wiki/Winchester_Model_121

    The Winchester Model 121 is a single-shot bolt-action.22 caliber rimfire rifle that was produced from 1967 to 1973 by the Winchester Repeating Arms Company. The 121 can fire .22 Short, .22 Long, or .22 Long Rifle cartridges from its 20¾" barrel. The barrel rifling is 1 turn in 16 inches with a right-hand twist.

  6. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.

  7. Thompson/Center Contender - Wikipedia

    en.wikipedia.org/wiki/Thompson/Center_Contender

    The first variant has a push button selector on the hammer for choosing rimfire vs. centerfire, the second variant has a left-center-right toggle switch for selecting center fire-safe-rimfire firing pins, and the third variant has a horizontal bolt selection for choosing center fire-safe-rimfire firing pin positions.

  8. .22 Winchester Rimfire - Wikipedia

    en.wikipedia.org/wiki/.22_Winchester_Rimfire

    A variety of Winchester, Remington, and Stevens single-shot and repeater rifles were offered from 1890 onward, but new rifles are not made for this cartridge. .22 WRF ammunition is periodically offered by commercial makers for use in the old guns. [2] It can be fired in any rifle chambered for the more powerful .22 WMR. [2]

  9. Caliber conversion device - Wikipedia

    en.wikipedia.org/wiki/Caliber_conversion_device

    A notable exception to this is the Thompson Center Arms Contender, which has both centerfire and rimfire firing pins which can be selected with the turn of a switch, and does not require a centerfire to rimfire converter. The Hammond Game Getter works around this problem in its sleeves for .22 rimfire by creating an eccentric chamber that ...

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