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dyl,
You can use a fired case (with the spent primer still intact) as the crucible to melt some soft lead in. You will need the following tools to accomplish the project:
Nylon mallet
Inertia bullet puller
copper or brass pin of lesser diameter than the bore
hardwood dowel of lesser diameter than the bore
sizing die lubricant
Melt enough soft lead in the fired case with a torch. The tapered interior of the case will provide a very nice tapered slug. Let it cool and then knock it out with the inertia bullet puller onto a soft towel. Lubricate the slug and then insert it into the crown end of the bore. Tap it with the nylon mallet until it stops. Then follow up with the copper or brass pin until it passes the crown. Then continue with the hardwood dowel until it drops from the chamber end onto a soft towel. With a zeroed micrometer, measure the largest diameter. This will be the groove diameter of that barrel. Add 0.001" to that dimension and that will be the minimum sized diameter that you need to order by.
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Matt Dardas
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