Anyone forming their own .300wm brass

Discussion in 'Reloading' started by joe0121, Apr 17, 2012.

  1. joe0121

    joe0121 Well-Known Member

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    I am getting some pretty sever soot on the case necks with my .300 even with several factory loads. I was kicking around the idea of forming my brass from on of the win mags parent case then minimally trimming the neck so it barely fits in the chamber. This would also allow to to neck turn and still keep the brass pretty think to increase neck tension.
     
  2. Bart B

    Bart B Well-Known Member

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    Use a different powder that's cleaner. You need plenty of neck clearance for best accuracy. IMR4350's a good choice for bullets 165 through 220 grains.

    Your barrel may have a chamber or bore dimensional issue; I'd have them checked.
     

  3. joe0121

    joe0121 Well-Known Member

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    Interesting indeed. I have had great luck with h1000 but even a few different brands of factory powder exhibit this. I don't really have a smith nearby to do it ill have to send it to someone.
     
  4. 7stw

    7stw Well-Known Member

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    I have to agree with Bart. Typically when you get case neck " sooting"' that usually means powder is to slow, and is not sealing the neck when fired. It also could be that the case neck area is extra generous. The best you can do, it use the faster burning powder, ie, 4350' or IMR 4831. Both of them typically burn clean, and quick enough to seal the necks,without spiking pressures. Sometimes, you can not get rid of it totally, but it can be minimized by powder selection, and common sense. Take care, and be careful. I would not bother with the fire forming thing. To much hassle, with to little gain, if any!
     
  5. joe0121

    joe0121 Well-Known Member

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    Thanks for the input Ill pick up some 4831 and see how I like it.