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JCHannum
10-24-2003, 10:15 PM
I have lined several barrels with .22 liners from Numrich Arms. I have had good success.
I decided to try a .17 HMR, and got a Redman liner from Brownells. This liner has a groove machined on one end that they say is the breech end. Grooved section is removed when installing.
No problem, I am just curious as to what makes one end different than the other???

Yankee1
10-25-2003, 12:24 AM
Hello
Is it possibly choked on the muzzle end
for accuracy.
yankee1

JCHannum
10-25-2003, 09:54 AM
I doubt that, as it is cut to length depending on length of barrel. Bore diameter is the same, 0.1675 each end.

SGW
10-25-2003, 10:10 AM
Gain twist rifling???

Yankee1
10-25-2003, 02:29 PM
Could it be used to line up an index mark
put on the barrel to aid in extractor groove
positioning of the liner?
yankee1

Hellbender
10-25-2003, 03:35 PM
I read of this in very old gunsmithing books, but never seen it.

I believe it signifies the direction the cutter is pulled from when rifling the bore.....

IE, it may be "smoother" one direction for bullet passage.

HB

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NRA Lifetime Member

gamachinist
10-25-2003, 04:10 PM
Hellbender's got it right.
I called Redmans and asked.
He also told me it may not make a difference as it's an unproven theory to him.
Robert.

JCHannum
10-25-2003, 07:12 PM
Unproven theory sounds like a good answer. I can handle that. It is button rifled, so it should not matter, might make a bit of difference with cut rifling. I had never seen reference anywhere else in rebarreling literature.

alcova
10-26-2003, 01:26 AM
I have seen that reference for cut and button rifled barrels... Benchrest people pay close attention to that too and they are always trying for the best that they get

Walt

Yankee1
10-26-2003, 03:09 PM
How is the insert held while it is being rifled? What stops it from rotating while
it is resistng the pressure of the rifling
device? Seems a groove on the sleeve would
be handy to engage a spline on the holding
device. As thin as the material is I would
not want to clamp it enough to distend the
shape or the bore.
Just still thinking about it.
yankee1

JCHannum
10-26-2003, 06:40 PM
The groove is circumferential. It may be for fixturing or retaining the sleeve while rifling. Numrich may do differently, thus no groove on theirs.