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Modern Smokeless 577/450 loads
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Old 08-05-2007, 10:28 AM
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Default Modern Smokeless 577/450 loads

There has been much discussion on a number of occasions both on this list and on others about the possible power of the 577/450 cartridge using modern smokeless powders, modern 458 cal barrels and bullets and Martini actions with smaller firing pins and sleeved firing pin holes.
Now, since I have a Martini Enfield action which is practically the same as the MH action with the exception of the extractor and reduced firing pin, surely the old 450 case could be pushed up to and over 40,000 psi, almost to 45k, which is the safe limit for 303 ammunition.
Could someone run some figures in QuikLOAD or a similar program to estimate exactly which powders would suit (please include ADI powders like AR2207) so that I could get an idea of the possibilities of such a set up?
Oh, and could you calculate it on a 480gr or 500gr bullet.
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