Zippy, where I hear about them is from my English friends who can't use plastic wads for enviro reasons. A lot of hunters here, and certain clubs, etc, seem to be adopting the older retro standard to cut down on the "trash" left behind after shooting.
One nice thing about them, is they are gentle on older guns, so if someone is shooting grandpa's Parker from the 20's, the pressures are typically lower
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