I don't have any theoretical evidence, but I think it's self explanatory, higher pressure behind pellet + friction resistance, the soft metal skirt will expand as it's moving (if it has place to expand)?Originally Posted by hmangphilly
Do you think otherwise?
I have done a test where I have squashed a pellet skirt and measured the velocity, as expected it was lower, however the skirt 'opened' up. Probably more pronounced in a springer due to higher pressure... I only shoot spring guns.
As you work with barrels, you could do an experiment, where you push a pellet through a barrel (hence 0 pressure on skirt) and see how the skirt is deformed, and fire one, if the markings on the one that has been fired are deeper, the skirt has expanded.
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