ideally, you want the bullet to be sized .001" over bore diameter to get a proper seal. At first I was sizing to .311 since thats the closest I had on hand but it was too large. Bullets should be sized. For more info, head on over to castboolits.gunloads.com everyting you ever cared to know about casting. The lee moulds for the 7.62x39 work well in the whisper.
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