10.15x61R Jarmann – 0.406 or 0.407 Caliber

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  • 2015-03-23 at 20:44 #487938
    paulskvorc
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      I’m hoping this is the place to initiate this conversation.

      The barrels of the several rifles I have measured chambered for this cartridge have had bores of 0.399-0.400″ and grooves of 0.406-0.407″. These seem to fall right between the common .40/10mm and the .41 calibers molds available. I think/hope there might be some interest in a mold for this ‘in between’ caliber. I like the design of the 360 grain .412 caliber bullet, and would be happy with that design ‘adjusted’ to throw a 0.406 or 0.407 bullet. Maybe a 0.408 to be sized to 0.406 or 0.407. Those that might be interested in a group buy could decide the final specs.

      Paul

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    • 2015-03-29 at 11:41 #497257
      nobade
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        This is the same size that black powder cartridge rifles use, so there should be a market for them. However, there are many good designs available already. Does your rifle take a unusual nose profile or anything different from commonly available bullet designs?

        2015-03-29 at 16:18 #497258
        paulskvorc
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          I’ve seen a few Lymans in that range. Nothing I particularly care for and none with gas checks if I remember correctly.

          Paul

          2015-03-30 at 17:08 #497259
          paulskvorc
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            1111-217-412%20360Gr%20FN%20GC_zpslmbjesrc.jpg

            I’ve not seen the likes of this, or any .406-ish, bullet that has the following characterisics:
            1) “Nice” weight, (could be 50 – 100 grains lighter),
            2) Gas check,
            3) Long bore-riding section behind ogive and bore diameter lube grooves.

            If anyone here has seen a mold in production similar to this, please point me at them.

            Paul

            2015-03-31 at 12:11 #497260
            nobade
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              Ah ha! I see…

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