The Technoid over on Shotgun Report has some input on these, and in a recent issue of Shotgun Sports, Stan Baker mentioned them also.
Downside, Baker reports that they dirty up the bore right in front of the chamber, and if a 12 ga load is fired w/o first cleaning out the buildup, a ring bulge may occur.
As for teaching kids, any reloader can come up with something like the 3/4 oz 12 gauge load Son is using. Standard components, plus one 28 ga felt wad in the shot cup. Circle Fly carries these wads. The BP wonderwads oughta work too.
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