Dale53
posted this
12 January 2009
Many years ago, I ordered a match reamer from a respected reamer manufacturer. The pilot was too large to chamber in my particular barrel. THAT is when I learned that .22 barrel specs are all over the place. I sent the reamer back to the same company and had them make me a separate piloted reamer to fit my barrel.
The pilots are aluminum and fit tightly in the barrel and the reamer pivots on the INSIDE of the pilot. That way, you can turn a pilot to fit YOUR barrel. I have had a gunsmith friend chamber several different .22 barrels and liners with the same reamer, only changing the pilots with EXCELLENT results.
I and two friends spent most of one summer reaching serious conclusions about .22 barrels, actions, and chambers, etc. We were on the range three times a week that summer but it sure was worth it. We agreed that if all of us were unable to produce a result from a particular theory, then it didn't count(:>)). Good stuff came from that summer!
Clymer was my reamer company but they can only do what you tell them to do, if you know (or conversely, you can LISTEN to them with excellent results). Get a good match reamer (Ed Harris certainly knows what he is talking about) with a removable pilot. Then slug your barrel and send the slug (you really ought to send several) to Clymer or your reamer manufacturer of choice. That way you'll get the best chamber you can have.
By the way, I am not familiar with the Uberti low-wall but I have a good bit of experience with original Winchester low-walls. The original low-walls breech blocks were beveled on top to help seat the bullet. The Winchester action has a breech block that is not quite a right angle to the bore but while that angle helps to lock up tight is does little to seat a bullet in a tight match chamber in that falling block rifle.
What we did is specify an Auto Match Chamber for use with falling block rifles and have done several low-walls with excellent results using this Auto Match Chamber (made for 10/22's). If the chamber is TOO tight you'll have problems seating a bullet with the low-wall in a “too tight” match chamber.
On the other hand, a Stevens 44 or 44½ action as well as a Ballard has enough “rocking motion” in the breechblock to greatly facilitate seating match .22's in a tight match chamber. BSA International Martinis use a long bevel in the top of the pivoting breechblock to properly seat a cartridge in a tight match chamber.
Dale53