257-90-FN (Bob’s Boat tails)

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  • 2015-10-13 at 16:00 #488314
    SwedeNelson
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      Working with rsterne (Bob’s Boat tails) on some Air rifle moulds
      We have come up with the following design
      9″ Twist


      Post if you have any interest and will see what we can do.

      Bullet maker, maker
      Al Nelson

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    • 2015-11-23 at 16:41 #500764
      rsterne
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        I’m in, with a Lyman style HP pin in one cavity, if available….

        Bob

        2017-12-15 at 03:55 #500765
        rsterne
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          I’m bumping this design back up to the top to see if I can stir more interest in it…. I have a 10″ twist TJ’s 25-35 barrel that I really want to try it in…. I’d love to see it with a Lyman HP pin in one cavity….

          Bob

          2017-12-21 at 01:21 #500766
          owencoors1
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            I’d like to get one of these in 3x cavity, aluminum, FN configuration, please.

            2017-12-25 at 02:45 #500767
            owencoors1
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              After a casting session, today, with the 2-cavity, aluminum, .253-65 HP BBT mould, instead of a 3-cavity FN mould, as requested in the previous post, I’d now rather like to get a 2-cavity with HP pin, in brass.

              2019-03-08 at 03:55 #500768
              rsterne
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                If we can convince Al to make this mould available as the RG2 and RG4 moulds, with a HP in all cavities, I think the interest would increase a lot….

                I would take an RG4….

                Bob

                2019-03-08 at 03:56 #500769
                stephendampier
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                  I’m in! I now have two hungry .257 rifles. Make this happen!

                  2019-08-12 at 18:56 #500770
                  rsterne
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                    NOTE:

                    Based on the results of the .308 cal 154 gr. BBT, which has identical proportions, there is a good chance that this bullet would be usable in a 12″ twist….

                    Bob

                    2019-09-23 at 20:43 #500771
                    owencoors1
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                      If this mold will be offered as a hollowpoint in both cavities, then please put my name on the list. I want brass, 2-cavity, RG-hollowpoint

                      2019-10-13 at 18:21 #500772
                      owencoors1
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                        Is the meplat diameter too small for this bullet to be hollowpointed? If so, I’d still like to see this bullet come to being produced, as an FN bullet. The 1:10″ twist barrel that I’m using is stabilizing even the full-spire-point Ideal 257388 bullets for sub-moa results at 100 meters. I would think that this 90 grain boattail would do as well or better.

                        2019-10-13 at 22:26 #500773
                        rsterne
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                          The new thin RG pins Al has developed should allow this bullet to have a HP…. I want an RG4 mould, so I hope so…. I would think it should work great in a 10″ twist….

                          Bob

                          2019-10-20 at 20:09 #500774
                          owencoors1
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                            That’s good news. I now have one of the Noe 75 grain RG-2 molds and I must say that I like this hollowpoint method a lot! I certainly hope that he produces this 90 grain boattail with the RG-hollowpointing.

                            2019-10-27 at 20:51 #500775
                            owencoors1
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                              I noticed in the “active group buys” section that the 78 grain FN boattal is listed.. Is that bullet somewhat redundent, now that the 75 grain FN BT is available? If so, I’d like to see this 90 grain BT slide down to the active buy list. Also, Bob, would you be interested in designing a 6mm boattail , hollowpoint ???, for a 1:9″ twist? I don’t know what weight is supposed to stabilize for that cal/twist-rate, 75, 80, 85, 90 grains? I have a 26″ stainless barrel, but again it needs to be turned down and fitted to the Airforce action.

                              2019-10-27 at 22:30 #500776
                              rsterne
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                                The 75 gr. BT is a modified Lyman 257420…. The 78 gr. BBT is one of the Bob’s Boattail family, with a longer BT, and sits between the 64 gr. and 90 gr. in that lineup…. I don’t think removing the 78 gr. BBT from the AR Group Buys would enhance the orders for the 90 gr. BBT…. If we get another 1 or 2 people interested in this 90 gr. BBT, it will move to GB status….

                                If the 90 gr. .257 BBT was scaled down to 6mm (0.243″), it would weigh about 76 gr. as a FN, and about 3 gr. lighter as a HP…. It would stabilize just fine in a 9″ (or 10″) twist…. I have done a drawing for it and put it in this AR discussion section under 243-76-FN (BBT)….

                                http://noebulletmolds.com/smf/index.php/topic,2897.0.html

                                Bob

                                2019-10-30 at 19:34 #500777
                                owencoors1
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                                  Oh, OK. Yes, if the 78 grain BBT (HP) was available simultaniously with the 75gr modified Lyman 257420 BT HP, I’d have bought the 78gr instead.
                                  Thanks for honoring my requst for a 6mm BT HP, but as you descibe it yourself in that new bullet thread, it’s not going to work in the 1:9″ twist barrel. I’m going to give myself to getting this barrel fitted to an Airforce action, so that I can have some actual data to share. I’m guessing that the RCBS 95gr .243 bullets will stabilize in this barrel at roughly 1000fps, but I won’t know for certain until I do.

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