View Full Version : Barrel Liner

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???

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

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.

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

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?

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.


NRA Lifetime Member

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.

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.

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


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.

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.