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5.7x28 FN Bolt action Rifle

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  • 5.7x28 FN Bolt action Rifle

    Thoughts on converting a 22 magnum to this cartridge so you would have a reloadable 22 LR/ magnum cartridge.
    Is it feasable?

  • #2
    Isn't the 22M a rimfire and the 5.7 a centerfire?

    andy b.
    The danger is not that computers will come to think like men - but that men will come to think like computers. - some guy on another forum not dedicated to machining

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    • #3
      this started me thinking.I know: everybody RUN. i dont know about feasible. the .223 rem is 5.56x45 and i use .224 bullets in my reloads. i was thinking of converting a 5MM rem of years back to 5.7 but i just looked at a drill chart and find a 5.70 drill to be .2240". while it may be possible to "make" it fit in a 22lr or mag: will the rechambered action be strong enough to handle 5.7 pressures? also cartridge length differences may create feeding issues in any action other than a hand-fed single shot.i think this is a bottle necked cartridge and the head diameter may exclude building on any action other than a single shot. these are just my quick thoughts. find out cartridge measurements of both,top to bottom,side to side,head to toe. and most importantly-look at chamber pressures. i may look up this info tomorrow.

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      • #4
        The 5.7 operates at about 50,000 psi, much more than any rimfire acton/barrel are designed for. Also, it needs a 9" twist for proper bullet stability...most .22 l.r. and magnum barrels are in the 16" to 14" twist range. I would say that this is probably not the best idea. <VBG>

        If you can find any, the .22 Cooper Magnum was a centerfire cartridge only very slightly larger than the .22 rimfire magnum. Brass is scarce, but sometimes becomes available. You could also look for the very obsolete 5.75 Velo Dog brass. Fiocchi made it up till about three or four years ago, it's just slightly shorter than the Cooper cartridge.

        David
        David Kaiser
        “You can have peace. Or you can have freedom. Don't ever count on having both at once.”
        ― Robert A. Heinlein

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        • #5
          Why not just settle for a .22 Hornet? Both empty brass and loaded ammo is still available for this old timer, believe it or not.

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          • #6
            I found some of both types of brass on the range and they are similar size but one is reloadable and the other is not.The ability to reload and download to 22lr performance and also use cast bullets( Or boolits as they are affectionately called on another site).
            I have read about others looking for a reloadable cartridge similar to the 22 LR. I have recently read about the 22 CCM, Cooper Centerfire Magnum, but it is now discontinued.
            Last edited by deltaenterprizes; 12-15-2009, 07:16 PM.

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            • #7
              You get the same advice as I give to all people that wont to do some conversion.
              DON"T DO IT!!!!!!!!!!!!
              Sell the gun you have and buy the one you wont.
              As soon as you start changing things the value goes to nothing.
              Case in point. I picked up a wonderfully done 1903 Springfield that if left original would have been $700 I payed $50 for it.

              If you would like to pick a very good all a round cartridge pick a 22 Hornet.
              I make some that are 22LR equivalent, some mid power cast & Full power Jacketed.

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              • #8
                Originally posted by mcskipper
                You get the same advice as I give to all people that wont to do some conversion.
                DON"T DO IT!!!!!!!!!!!!
                Sell the gun you have and buy the one you wont.
                As soon as you start changing things the value goes to nothing.
                Case in point. I picked up a wonderfully done 1903 Springfield that if left original would have been $700 I payed $50 for it.

                If you would like to pick a very good all a round cartridge pick a 22 Hornet.
                I make some that are 22LR equivalent, some mid power cast & Full power Jacketed.
                I don't have a 22 mag, I thought it would be an interesting conversion for a junker with a rental reamer for about $25.

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                • #9
                  A couple of other things to consider. Most .22 rimfire rifles, even Mags, have their barrels pinned in to the action, not threaded. The locking system on most bolt actions is simply the bolt handle where it attaches to the bolt body, engaging a cut in the receiver wall. Not enough strength in these designs for even reduced loads out of a cartridge like the .22 Hornet, much less the 5.7x28.

                  You also need to look at the ethics of what you are doing. I've turned down work from folks who wanted to chamber rifles for loads that, from the factory, were too hot for the action. Even when they told me that they would be handloading light loads, you have to look at the safety of the rig when factory loads might be used. If your friends get your guns after you are gone, or your kids or grandkids get them, and run the factory loads that the weak action rifle is chambered for in it, what bad things might happen to them? Not something I would want to have happen, either as the gun owner (bad for my karma!) or the gunsmith who did the work requested.

                  Ok, off my soapbox!

                  David
                  David Kaiser
                  “You can have peace. Or you can have freedom. Don't ever count on having both at once.”
                  ― Robert A. Heinlein

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                  • #10
                    It can be done and has been done! Check this out:http://www.saubier.com/forum.html

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                    • #11
                      Originally posted by deltaenterprizes
                      It can be done and has been done! Check this out:http://www.saubier.com/forum.html
                      which topic or thread??? I'm curious about a hornet conversion??

                      Respect Always
                      Metalshaper/Jonathan

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                      • #12
                        Do a search for 5.7x28

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                        • #13
                          The only reference to a 5.7x28 I could find on that site was done on an AR. That would be an acceptable conversion. A conversion to any centerfire 22 caliber using a rimfire rifle as a basis, whether 22 or 22 magnum would be unsafe.

                          Listen to Dave, he knows what he is talking about. Aside from the mechanical considerations of the barrel being pinned and the bolt lockup, the metallurgy is usually not sufficient to handle the pressures involved. An additional caveat is that the bore dimensions might be too small, further increasing the already dangerous pressure levelss.

                          There are a very few rifles that would make acceptable donors, but unless you have done your homework, know the materials of construction and all other parameters involved, do not do it.
                          Jim H.

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                          • #14
                            A search of 5.7x28 foud 4 pages of threads last night. Some talked about converting Remington 580 and 590 series rifles to centerfire. Someone claimed that the 590's were originally proofed at about 55,000 psi.

                            I don't think that is enough of a safety factor but a similar design scaled up a little would be nice, as would a mini mauser like the CZ.
                            North Central Arkansas

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                            • #15
                              when I was originally researching the 22 hornet cartridge, as a potential project..

                              I was surprised that on a couple of sites, they referenced some of the original Hornet rifles,, were made by re-chambering 22RF barrels. the big thing they stated was to slug the bores, so you knew which diameter of 22 caliber bullet to use.

                              I have a couple of 22 barrels down in the shop?? but knew I didn't have all the knowledge I'd need to make either of them work, for a hornet. Figured they will get used as is! and it gives me a reason to look for another barrel!!

                              Always looking to lean something new!!

                              Respect Always
                              Metalshaper/Jonathan

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