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Yea you need the weight, if you remove an OZ of lead you need to get a substitute, of the same weight or at least close,
wax and iron stone said above, mostly its waste of time, but its fun to...

I shot a farm in Canada for pheasants and grouse, the grumpy old bugger, said, yep but no lead, copper, steel or plastic,
Came back a couple weeks latter, and he insisted on pulling apart two...