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Old March 22, 2005, 08:44 AM   #34
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 41,374
"i want to know what makes 296 and h110 heavy duty mangum powders, AA#9 more accurate, and 231 a less than ideal magnum load"

Wizards and magical incantations.

Actually, that's just for why AA #9 is more accurate. Who knows why some guns love one powder, and hate another.

As for 296/110 and 231's suitability, it all has to do with burning rate. Smokeless powders are all chemically VERY similar, at least the base material--a nitrocellulose base material, to which nitroglycerine can be added (making a double based powder).

It's when you get into granule shape, the deterrent coatings applied/mixed in, etc., that you get the wide range of powders.
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