What are these reamers for?????

[rolland]

A friend dropped these reamers off said they were in his fathers things, he had a gun shop many years ago,
I neglected to add sizes ..371, .3695, .343, .312, .250

[epicfail48]

Are those tapered at all? First though is some sort of bridge reamer

Actually, is the 'pilot' at the end the same diameter as the driven end?

[andywander]

they might be for line reaming separated pairs of bushings, like those in carburetors for throttle shafts, etc.

[Dave C]

Chamber reamers ?

[JRouche]

Are those tapered

They didnt look tapered to me until I lookrd closly. They look to have afine taper on them.

I dont know, hahaa. Im not a machinist, obviously.

I have some somall straigh cutting reamers, which these appear to be small.

Mine are nothing like these. Those look like a drill bit grind. Dunno.

My tiny reamers/ I lost my 6" rule for pics. So glasses it is. These are tiny. Dont expect to remve anything but a slight burr with these. If you do, you will snap it. JR

[BCRider]

Chamber reamers ?

Not that shape and length. They aren't even close to a chamber reamer shape.

One thought was for reaming out bores prior to rifling. The long forward pilot could be for ensuring a straighter run. But they aren't long enough to do any sort of rifle barrel. And I've never seen any reference to reaming the bores after a gun drilling operation. So it's a mystery...

[Astronowanabe]

gunsmith throat / neck reamers seem to come close but I never heard of them before

[DrMike]

Hard to tell without having even a hint of the diameter or length.
Based on the "gun shop" teaser and built in pilot, I'll guess they are to ream shotgun barrel forcing cones or chokes.

[nickel-city-fab]

Given the length of the pilots vs the length of the flutes, I'm gonna guess for re-lining small-caliber pistol barrels?

[A.K. Boomer]

they might be for line reaming separated pairs of bushings, like those in carburetors for throttle shafts, etc.

That's a good guess id say...

[John MacArthur]

I think throat reamers too, Astro. For increasing "freebore", or distance to the rifling from the bullet, to accommodate longer bullets. https://en.wikipedia.org/wiki/Freebore
Johnny

[BCRider]

Given the length of the pilots vs the length of the flutes, I'm gonna guess for re-lining small-caliber pistol barrels?

That's possible. But Brownell's only shows piloted drill bits for doing the prep work for relining. And nothing like that long a pilot. There'd be no need even on pistols for that long a pilot.

Same with the freebore option. There would be no need or desire for as long a pilot or cut to just push the beginning of the rifling lead out a very few thousandths.

I've been looking at this stuff as part of my interest in doctoring my own firearms and the stuff I've see that does the gunsmithing jobs mentioned don't look like these. As in not even close. So I'm thinking that it's from some other industry

[nickel-city-fab]

Or, (possible) custom-made reamers? Certainly they aren't in any catalog that I've seen. I can't think of any reason for that much pilot length other than concerns about accuracy.

That's possible. But Brownell's only shows piloted drill bits for doing the prep work for relining. And nothing like that long a pilot. There'd be no need even on pistols for that long a pilot.

Same with the freebore option. There would be no need or desire for as long a pilot or cut to just push the beginning of the rifling lead out a very few thousandths.

I've been looking at this stuff as part of my interest in doctoring my own firearms and the stuff I've see that does the gunsmithing jobs mentioned don't look like these. As in not even close. So I'm thinking that it's from some other industry

[andywander]

... I can't think of any reason for that much pilot length other than concerns about accuracy.

If you ever get the chance to ream some carburetor shaft bushings, you will see the reason immediately. The bushings are separated by at least an inch, and maybe as much as 2 or 3 inches.

[Joel]

Like Andy said:
https://www.minimania.com/part/TOOL1...e-Shaft-Reamer

Not that they can't be used for any similar type of work.
What are the diameters? If they were used for pistol barrels, the diameters should match up to common calibers, no?