Is there Non machining way to round compression tube?

[eezapz2101]

Like the tittle says would you guys know of a way to get my compression tube on my Diana 460 true round?
Will honing it with a break cylinder hone 200 grit get the job done?
Or am I going to have to take it to a machinist to get it true round?

[MichaelM]

... my question is.. how do you know its out of round?

[eezapz2101]

... my question is.. how do you know its out of round?

Right now I don't know that it's out of round but I'm just gathering info if need be
I've had issued with my rifles velocity but won't now till I do a chrony test this week, but if the numbers the chrony gives me are as what my chrono connect app gave me then the last two thing to check would be compression tube internal round or the barrel

Like I said I'm just trying to gather knowledge before I get there. Just In Case

[Roadworthy]

As a general rule a defective seal (piston or breech) will be the culprit.  The breech seal is easy to test with tissue.  The piston seal may look good to the eye and still be defective.

Taking the compression tube to a machine shop would be a last choice for me.

[eezapz2101]

As a general rule a defective seal (piston or breech) will be the culprit.  The breech seal is easy to test with tissue.  The piston seal may look good to the eye and still be defective.

Taking the compression tube to a machine shop would be a last choice for me.

Al ready did the tissue no leeks
Oring seal seemed good but as soon as I get the chrony I'll run the chrony with the new installed oring seal and then the parachute seal just to verify my numbers

[AmBraCol]

To get it "true round" you'd definitely have to have it bored on a lathe.  A brake hone is going to follow the contours that are there as the stones are spring mounted so they move in and out according to any variation in the chamber wall.  But the probability of your chamber needing to be trued up on a lathe is very remote.  Seals also adapt to the walls of the chamber so a good seal in a smooth chamber should produce good, consistent pressure.