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Posted: 1/23/2013 1:42:05 PM EDT
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Looking at casting some 223 for my sig 556 and the only mold in stock anywhereis the Lyman # 225415 mold.
My rifle shoots 55 grain fmj just fine,would this be long enough to stabilize in a 1-7 twist? |
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The question is generally whether the bullet is too long to stabilize in a slow twist barrel.
That one will work in a 7 twist as long as it's running slow enough. Thinking this through a little, the bullet has a much more blunt meplat and ogive than a typical spitzer bullet of the same weight, and it has no copper jacket, so it has to be shorter than a flat base jacketed bullet. It will shoot in any rifling twist rate that the 55 grain spitzer can use. |
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Quoted:
The question is generally whether the bullet is too long to stabilize in a slow twist barrel. That one will work in a 7 twist as long as it's running slow enough. Thinking this through a little, the bullet has a much more blunt meplat and ogive than a typical spitzer bullet of the same weight, and it has no copper jacket, so it has to be shorter than a flat base jacketed bullet. It will shoot in any rifling twist rate that the 55 grain spitzer can use. Excellent that's exactly the info I was looking for. Thanks again aero you are the man. 
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I don't know much about the gas system on that SIg, and I don't have any experience actually shooting cast in a gas operated semi-auto, but I'd approach that project with some caution. I'd be worried about bullet lub and lead particles (including molten lead) going thru the gas port into the gas system. I think that model is piston operated, and I'd want to know before hand how hard it would be to clean the mess up.
I know on the Desert Eagle gas operated pistol, the manufacturer specifically recommends against cast bullets because of the gas system. |
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