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I have heard a lot of talk about importance of uniform flash hole dimensions for accuracy, and recently someone said that larger than 'normal'( whatever this is) flash holes could have ill effects when using ball powder, and even be dangerous. Is there some truth in the danger item?
 

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In a post sometime ago I discused flash-holes in detail. Factory specs call for flash-holes to fall between .078" to .080". Some makes of brass sometime have smaller flash-holes, especially in small calibres such as Hornet, and there may be interference if the decapping pin is a bit generous in diameter. I have found that in order to get absolute uniformity in flash-hole size I have to go up to .080" drill. There are some of the extra fine Ball powders that can migrate into the primer. This does not affect the PSI of the cartridge, but will flatten out the primer somewhat. This is why one should use case expansion of a factory load as a gauge on reloads. When one is testing ammo they should be absolute that the primer pockets are uniforn as there is a direct relationship between primer pocket uniformity and shot to shot variations.
Best Regards, James
 

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Here are the previous two threads for some added info on this subject:

http://beartoothbullets.com/cgi-bin/ikonboard/topic.cgi?forum=2&topic=39

http://beartoothbullets.com/cgi-bin/ikonboard/topic.cgi?forum=2&topic=56

Regards, Ray
 
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