Rifling

[adam_p]

Any chance that is damage?

That is 100% tooling chatter. Its not that uncommon on cheap barrels.

[PVDT]

Looks like most savage barrels

But isn’t it strange how most Savages shoot so well?

[Walker]

Did some research last night. Seems this is not uncommon in button rifled barrels. Some shoot good some not so good. Will

[imyomama]

i'd use it for a breaker bar and start over ....

[CBHunter]

i'd use it for a breaker bar and start over ....

Best answer.

[Walker]

i'd use it for a breaker bar and start over ....

Could be. I'll know in a couple or hours when my son comes back from the range.

[Walker]

Pretty sad results. New Primary Arms barrel is on the way.

[muzzlebrake]

You could take the barrel off and stress relieve it and maybe tighten that grouping up. To stress relieve you have to heat soak it at 1050 degrees for about 2 hours then let it cool slowly at 50 degrees per hour until its room temperature. After that it needs to be cryo'd at -320 degrees for 24 hours.
Cheap barrel makers don't go to this time and expense but if they did the barrels wouldn't be cheap anymore. Manufacturers that do this have a lot of investment in equipment and can do hundreds at a time so the cost is spread out some but still adds cost. After the stress relieving the barrels must then be straightened and this adds more cost. Savage arms has a 3rd generation employee who hand straightens their rifle barrels. There is a video somewhere showing how he does it using a light and a manual wheel press.
Stress relieving the barrels helps keep the barrels from changing shape as they are heated up during firing live rounds. This shape shifting and oscillation is what is happening to your barrel due to the stresses left in the metal.
Forged rifling barrels don't generally require stress relieving since the forging process does it already. Broach and single cut rifling barrels are generally stress relieved prior to the rifling process. Some or most of the higher end barrels are cryo treated afterward.

[muzzlebrake]

On the cheap you might just drop in into an Ice chest full of dry ice for 24 hours and see it it helps it any. Sure can't hurt anything. I have done it to knife blades a few times and it seems to help with edge holding and sharpness. Most of the knife blade steel I buy is already stress relieved somewhat and the heating and tempering process I use gets the remainder out.

[Walker]

I'd try cryo if I still had my semen tank but it's long gone. Haven't done AI in 40 years. I'll just wait on the new barrel.

[hpdrifter]

Not uncommon on cheaply made barrels. If it was a quality manufacturer I’d send it back. Might try fire lapping. Bore scopes are the cat’s meow when checking for accuracy problems.

all I buy is cheap rifles...and I've never seen anything like that.

that's p***poor excuse for rifling.

[Walker]

The new barrel came in and my son put it on. Maybe a concern, maybe not. The gas port is tiny. Have to try it out when things dry up around here.

[hpdrifter]

The new barrel came in and my son put it on. Maybe a concern, maybe not. The gas port is tiny. Have to try it out when things dry up around here.

port size depends on what length the gas port is from breech or really the closer it gets to the muzzle.
as the ratio between breech and muzzle gets to favoring the muzzle, the bigger the gas port.

[Walker]

port size depends on what length the gas port is from breech.
the further away it gets, the bigger the gas port.

16" barrel with mid length gas port. I didntbsee it but my son said it was significantly smaller than the old barrel. No problem though. I'm fully prepared to drill it if necessary.

[dbaio1]

Cheap and barrel are not a combination I want any part of, I would ditch barrel.