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  • 1 Post By Cordite
  • 1 Post By gonetropo

Thread: Unbelievable ballistics?

  1. #1
    Member Cordite's Avatar
    Join Date
    May 2017
    NZ Mainland

    Unbelievable ballistics?

    Just having an idle moment or two. Reading about the 4.5x26 MKR cartridge and rifle of the late 70's early 80's Sweden.

    Pushing a very aerodynamic cold swaged solid copper spitzer of 24.4grains at 3,270fps (just short of 1000m/sec) from a curved tapered .22WMR, the curved taper likely a compromise between volume and ease of extraction. Firing from locked bolt due to the light case and the high pressures involved.

    Here is an image, demonstrating 7 rounds MKR was same weight as 2 rounds 5.56NATO. The tracers would look great, like a little row of red-topped garden gnomes:

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    Cartridges for the rejected military rifle were to be shipped in prefilled 50rd magazines -- I guess because they were fiddly and vulnerable to damage.

    The plastic Swedish gun - single, 3-rd burst, or full auto. The 3-rd burst at 1800rds/min (30rds/sec0, might have been useful for goats, in a different world.

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    The unbelievable part is the quoted ballistics which are significantly in excess of the .17 WSM (25 grainer at 2,600 ft/s or 790 m/s), although the .17 WSM has the advantages of being designed 30+ years later and of being based on a thickened 7mm nail gun parent case. What am I missing?
    ChrisW likes this.
    "I find television very educating. Every time somebody turns on the set, I go into the other room and read a book." Groucho Marx

  2. #2
    Member Marty Henry's Avatar
    Join Date
    Oct 2014
    Look up the french THV Tres haute vitesse round as well and the gyrojet if you are interested in innovative ideas.

  3. #3
    Join Date
    Jun 2015
    Quote Originally Posted by Marty Henry View Post
    Look up the french THV Tres haute vitesse round as well and the gyrojet if you are interested in innovative ideas.
    and the dardick pistol
    Cordite likes this.



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