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Post by ET on Apr 12, 2014 7:06:50 GMT -5
Earnhardt
In answer to your question about 209 primers easily bursting, no I wouldn’t fear that readily happening. But I wouldn’t ignore the bulging of the primers either. When the wall casing of the primer stretches to a larger diameter the wall thickness is reduced and weakened. How much more pressure abuse can it handle I don’t know? Then there is the consideration of the quality the manufacturer of primers maintaining wall casing thickness and grade of metal.
As we’ve seen and learned it is not the peak pressure alone that contributes to 209 primer bulging but also the amount of pressure returning from the bore that slower burning powder generates. To increase the total diameter of a 2-hole orifice without addressing the primer bulging that IMO is getting a little dicey safety wise. Hey it’s your call on how you want to progress.
Ed
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Post by cowhunter on Apr 12, 2014 13:35:53 GMT -5
Earnhardt: Great test. I can't believe no one tested a .041 bushing or vent liner before. I guess I threw all my vent liners over .033 away. This pressure issue is hard to understand. I shot 95 grais of 4350 in a Swinglock .416 and got 2760 fps. I shot 95 grains of 4350 (same load) with a 30 grain lighter bullet in my .45 and got only about 2300 fps. Myers129, who has a Quick Load program, said the pressure in the .416 load was about 48000 psi. The pressure in the .45 700ml was only about 26000. I may be a bit off on those numbers. Anyway, we know the Bad Bull guys shoot 130-150 grains of 4350. I wonder if there is an amount of 4350 we could use in our 700ml or other custom .45s that would result in a load that would get us about 27-2900fps using Luke's 310 gr ASP?
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