Thread: Do you know your barrels??

Originally Posted by R93

Interesting, Vulcan eh? How do they shoot in general?

So do I win a prize? Not so sure on the boat idea anymore. I hear there is a few pillows on board with teething rings sewn into them

Prety good in general would be hard to tell them apart from any other Match tube

Good to hear the vulcan is leading the pack. Proofs in the puddng

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Ahh Now onto the curly questions.
What makes a "good" barrel?
Im sure we have all seen a horrible barrel that shoots.
Likewise a nice one that wont.
So what makes a good barrel?
Surface finish must only be a part of it,Ie consistent bore dia and or choke. Consistent twist rate or consistent gain for gain twist.Consistent land hight and thickness. Straightness of bore. And of course profile and length.

I know fu$k all about all this but understand if you swage a lead/copper slug threw a tight bit it wont fit snugly in the loose bit.

So what is the most important bit for an accurate barrel?

Concerntricity, accuracy in tolerances would be a start.
Length has a play as well.


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Concentricity would be more chambering and fitting to the action. Im talking about the tube itself.

Originally Posted by veitnamcam

Concentricity would be more chambering and fitting to the action. Im talking about the tube itself.

Originally Posted by veitnamcam

Concentricity would be more chambering and fitting to the action. Im talking about the tube itself.

not necceserily

No Cam, concerntricity through out the barrel.
I have looked through a few badly turned ones. It effects the pressures and impacts on the projectile.
In saying that I have seen bad ones that shoot very well too a certain distance.


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Pretty sure straight barrels seem to shoot well...... Take a lathe to the barrel shop boys

I have found nice tight bore to be good performers, barrel has to look good if it dont then they foul an may shoot well but have to scrub the cunt every 10shots an thats just a pain in the arse.
rifleing height not realy a issue as its aways the same when button cuts/pulled through.

I dont have gear to measure the barrel any futher than 6" down , i dont know how you would? so that one you would never know? but again the button comes in here
thats why button rifle makes have different grades, if it dont make the cut it goes doen, but cut rifling barrels are just the one grade its either good or scrap

contour is accuracy but still not much better heavy than light just a heavy barrel will hold accuracy longer in more shot strings

my 2c again no expert

Originally Posted by R93

No Cam, concerntricity through out the barrel.
I have looked through a few badly turned ones. It effects the pressures and impacts on the projectile.
In saying that I have seen bad ones that shoot very well too a certain distance.


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So straightness/roundness threw the lenght of the bore. Concentric generally means two things on the same axis or center

Pretty much mate.
Abe probably says it better.


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Its not uncomman for then not to be straight but not really a issue. i dont know how you would measure the bore dia right through? other than something push through an by feel?? how accurate is that

Originally Posted by R93

Pretty much mate.
Abe probably says it better.


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An im shit at explaining things!!! much easier in conversation than on the net

I watched a work mate cut about 6" off a barrel a couple of years back. The barrel had about 8mm runnout in the middle! but the hole up it was straight so when it was cut the bore was miles off center of the barrel


It was a rossi (not Dads one)

Originally Posted by veitnamcam

I watched a work mate cut about 6" off a barrel a couple of years back. The barrel had about 8mm runnout in the middle! but the hole up it was straight so when it was cut the bore was miles off center of the barrel


It was a rossi (not Dads one)

And that's why a REAL gunsmith threads and crowns a barrel different to most....