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6.5 gibbs

milcol.milcol. Member Posts: 4 ✭✭
edited October 2008 in Ask the Experts
Have been looking into the 6.5 gibbs and have a question on the forming of the 270 brass,is the case first sized in the 6.5 die then necked down to .264 then fireformed,any other information appreciated.


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    JustCJustC Member Posts: 16,056 ✭✭✭
    edited November -1
    6.5mm = .264", therefore, when it is sized down in the 6.5 gibbs die, it is ready to be loaded. However, with the forward shoulder of the gibbs, a "false shoulder" needs to be formed on the neck to hold the case in place during fire forming.

    It is easier to look at the 6.5-06 which will only require necking down 30-06 brass to 6.5mm and loading the round. This chambering does not move the shoulder forward and create the extra step in forming the brass. The Ackely Improved version will gain 100fps on the standard 6.5-06, so that is also worth noting as they are very easy to form as well.
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    nononsensenononsense Member Posts: 10,928 ✭✭✭✭
    edited November -1

    Hopefully one of us remembered to say Welcome way back when. If not, Welcome!

    This is a photograph of the .270 Win./6.5 Gibbs conversion:


    The trick, as JustC points out, is to form a false shoulder that is substantial enough to be capable of holding the case in position while the shoulder is being moved forward in the fireforming process.

    You can use a smaller diameter shoulder, like the .270, but make sure that you use a bullet jammed into the lands and full load for fireforming. Or you can use the inert filler method that combines a small weight of fast pistol powder separated with a small piece of toilet paper from something like grits or Cream of Wheat. This is all held in place by a plug of wax or even some of that old leftover bar soap. I prefer to neck the .270 cases up to 7mm (.284) before starting the necking down procedure. Both variations work.

    When using the inert filler, size the new neck carefully until you feel some real resistance when you close the bolt. This keeps the base of the cartridge against the bolt face while the new shoulder is tight against the new shoulder location in the chamber.

    You can also find cylindrical brass from both Huntingtons and Z-Hat. Z-Hat has a .264 wildcat of 'his' design which he named the .264 Hawk. Then you should take a look at:

    6.5 x 63 Messner

    6.5 x 64 Brenneke

    6.5 x 65 RWS

    6.5 x 68

    Like JustC suggests, fireforming the 6.5-06 Ackley Improved is much more simple. But if you really want to try another variation, there is the standardized 6.5/284 Norma which is a runaway with the popularity ratings.

    There's lots of ways to skin a cat, it just depends on how much or how little work you want to invest in the process.

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    jptatumjptatum Member Posts: 1,911 ✭✭✭✭✭
    edited November -1
    You should consider the 6.5X68. The ammunition, made by RWS, can be obtained from Jack First.
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