You could try increasing your temperature,and adding a little tin to the mix,I had to paint the inside of one mold to get a smooth finish.the tin will help with getting the mold cavities to fill out better. Your mileage may very the ones in your picture looks okay to me I've never had a fish turn down my rig because a sinker didn't look right??? At least not one I know of anyways
If you ever want to make them shiny and remove excess lead, put them in an aluminum pan and shake them around and around. I always do that before using......works for me.
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