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I reamed out necked down 30-30 cases made into 7mm International cases because the ID was too small after necking down. I used a Forster Original Case Trimmer with a .284 reaming tool. It worked perfectly.
https://www.forsterproducts.com/pro...onditioning-system/original-case-trimmer-kit/
https://www.forsterproducts.com/pro...onditioning-system/original-case-trimmer-kit/