Traditional Muzzleloading Association

Craftsmanship => Gun Building and Repair => Topic started by: MissouriKid87 on December 14, 2017, 01:51:26 PM

Title: Drill Bit Sizes
Post by: MissouriKid87 on December 14, 2017, 01:51:26 PM

Does anyone have the drill bit sizes for the following calibers: .31, .44 and .72 by chance? The .31, .44 are pistol and .72 is rifle.

Title: Re: Drill Bit Sizes
Post by: PetahW on December 14, 2017, 06:01:51 PM

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Presuming you want to drill a barrel prior to rifling it, subtract the depth of the rifling planned x 2 (both sides or the bore), then use this chart to find the drill bit number.

http://bobmay.astronomy.net/misc/drillchart.htm


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Title: Re: Drill Bit Sizes
Post by: Lonewolfe20 on January 24, 2018, 03:23:17 PM

That was a great page I just printed it out
Thanks PetahW