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use a pair of pliars or a sidecutter the lead will dent or mash down the zinc will scratch only the paint , some zinc will not have a rivet... most "fe" or iron , wil be riveted...... good...

i use the wc860 cheap surplus powder for a plinking load from a half full case to a full case i isnt very fast "50 caliber slow powder " so i use it with heavy bullets for a slow load i have...

are license plate metal frames zinc? it takes a lot to melt them .. trying to make zinc ingots from sources of ww's and dont want to mix my metals up ...,, ps i too have a difficult time ...