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Re: Internal diameter of extension tubes
Posted: Sat May 23, 2015 8:07 am
by gstarik
Yes,that's correct.
The Starik Carbon Tube (the one which Matt Emmons won WC Korea with) weights about 200gr depends on tube length.
Guy.
Re: Internal diameter of extension tubes
Posted: Sun May 24, 2015 3:22 pm
by patriot
Bee Sting Carbon Fiber 1.118 OD & .850 ID
My Anschutz 1813 factory barrel bulge at the muzzle is slightly wider; friction fit would be an issue. The 1913 is consistent.
Mark
Re: Internal diameter of extension tubes
Posted: Wed Sep 21, 2016 6:20 pm
by markgrabowski
gstarik wrote:From many tests and experiments,I can tell you that the minimum diameter of the inner tube should be more than 13mm.
Below that, accuracy goes down. All diameters above 13mm gave me the same results.
What really matters in my opinion,is the bloop tube weight. I have found out with Dr. Jeffrey Colbe(the previous owner of Border Barrels) that you can't tune for "positive compensation" if the weight of the tube is over 250gr.
Guy.
bump
Re: Internal diameter of extension tubes
Posted: Thu Sep 22, 2016 3:50 am
by Albert T
Guy,
Why does the smaller than 13mm give bad results? Is this because of gasses bouncing back and making a turbulence while the bullet passes through them? I can remember that Mike Eckhard many years ago designed a bloop-tube with an inner tube that was adjustable in the front-aft position in the main tube. It shielded the bullet from the turbulence. It was immediately banned by the ISSF!
Albert T
(The Netherlands)
Re: Internal diameter of extension tubes
Posted: Sat Sep 24, 2016 12:45 am
by Thedrifter
i would like to encourage the use of carbon fiber too. while i dont own one, i would like the beesting myself. its on my wish list.