Backcountry Pilot • Spun - up my first chamber

Spun - up my first chamber

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Re: Spun - up my first chamber

Very nice.
fshaw offline
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Re: Spun - up my first chamber

Been hoarding up parts for several months. Finished this one up last week, gonna let the kids fight over it. Borden Alpine action, X-Caliber barrel from Montana, McMillan Gamescout stock. Chambered in 7mm-08. With the suppressor screwed on, 3 touch at 100 and there's virtually no recoil. Awesome set up.

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gbflyer offline
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Re: Spun - up my first chamber

Great looking rifle!
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Re: Spun - up my first chamber

gbflyer wrote:I've seen pictures of gun drills but I'm not sure how they work. We need to get Spinner2 over here from SC.org to school us.

Barrels come with the bore and contour already done. All that's left is the threading and chambering. The chamber reamer is the shape of the cartridge but made with cutting edges out of high speed steel.


Gun drills typically are either a HSS or tube formed blank, with a carbide single flute head brazed on. There are special gun drilling machines, which have a spindle that counter rotates from the drill spindle, and there is a drill bushing that goes between the two to guide and support the drill while rotating and feeding.

Alternatively, you can actually gun drill without a gun drilling machine, by starting with a pilot hole that is about .0002-.0005" (not a typo) oversize from nominal, and about 2.5xD deep to act as your guide bushing. I do this a lot for drilling waterlines in mold bases.

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TheMachinist1 offline
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Re: Spun - up my first chamber

Whoa, that's some serious hardware!

Thanks for the explanation. The more I learn the less I know.
gbflyer offline
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Re: Spun - up my first chamber

Nice rifle!

So what's the sling? paracord?
ExperimentalAviator offline
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Re: Spun - up my first chamber

Yes it is paracord. Ran into them at a show down in Texas. The fellow hand - makes them here in the USA, takes him a couple hours. I asked for stainless hardware which he had never thought of, so he found what we needed and mailed me one to try out.
gbflyer offline
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Re: Spun - up my first chamber

Great looking rifle.

That is an interesting caliber. I've heard the lack of recoil is remarkable and you can't argue with accuracy like that.

I'll say it again: what a great winter hobby.
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