Dardas offers lead slugs for sale for slugging your barrel. You can then send him your slugs and he will measure the slug diameter for correct bullet sizing. This part is a free service. He then emails the info back to you. I measured my own slugs but had trouble getting a good read on my M&P 9mm barrel. He measured it out @ 0.356 which means I need a 0.357 bullet. I placed an order for the 0.357's.
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