Cylinder re-sizing

[D Sanders]

Just measured my pietta, cylinder is .448, barrel is .444 :grin:
nilo52

Check the groove depth on your barrel. That's only .002 per side. If your getting good accuracy, I wouldn't change a thing but if your Pietta has deep grooves (.005 to .009 per side) Like my ASM, I might try opening up the chambers a few thousandths and try a slightly larger ball.
It worked wonders for me. :thumbsup:

HH 60

 

[R.M.]

That would work, but opening up the Chambers is much easier and cheaper. A good machinist/ tool and die maker can make the chamber diameters anything you want. Trick is to find one of these fine gentleman that will do the work for you. HH 60

Not really. Finding somebody that has access to the proper size reamer is more of a trick.
.375" is 3/8", and would be a very common reamer. I have a few. I don't think you'd want to open it quite that far. A .373" reamer is available online for about $14.00 plus shipping. http://www.discount-tools.com/lav-533570.cfm
It's not that big of a job. It can be done in a decent drill press.