A few years ago I inherited about a half gallon of #6 shot from someone who quit reloading. I use a small funnel to get it in the cord. Then I hold the end with hemostats while I hold a lighter to it. I try to do it all in phases. First, I cut all the cord sections I'll need. Then I melt one end on all of them. Then I fill and seal them.
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If anybody needs me, I'll be on the river.