Quote:
Originally Posted by milkmanjoe
So there can be airspace between the powder and the bullet?
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Depending on the load yes. Sometes a lot,msometime a a little. I have some Trailboss that is a much fluffier powder to take up more space because 231 loaded in a 38-40 case woul only fill to about a third of the case. Then the powder sits on the bottom of the case and may not ignite correctly. Not enough to Squibb but maybe a lower velocity.
I loaded some .32 Magnum and could double charge the load without over flowing the case. That means single charge would take less than half of the case.
Yes many times there is a bit of space between the top of the powder and the bottom of the bullet. So a compressed load would be over filled with powder and squeezed or compressed down. VERY DANGEROUS with a powder that the burn rate is not appropriate for a compressed load.
For example, we load powder by weight. But 1 grain of W231 and 1 grain of AR Comp and 1grain of Trail Boss would all take up different volumes. Then compound the faster burn of the AR comp and you could have a high pressure spike than if you loaded the same volume of Trail Boss.