Charles E....Tensioned Barrels?

R

RoyB

Member
Hi Charles,

I saw you make mention of using Tensioned Barrels. I too have been experimenting with this technology.

How did you do it and how has it performed

Here's mine: (Note: It is now a 6BR )

Tensionsideview-vi.jpg


Tensionedbarrelparts-vi.jpg


BarrelNut-vi.jpg


More Here:

http://public.fotki.com/Rbertalotto/bang!/tension_barrel_project/
 
Roy,

Joel Pendergraft & I in the states (and probably some others), and Tony Z & Jeff Rogers in Australia (& maybe more, far as I know), have been experimenting with these for some years. Tony & Jeff seem to have better luck with the light guns (the type you show); Joel & I have had spotty results -- that is, sometimes success, but sometimes not -- certainly no formula that guarantees success with a light Gun.

With Heavy Guns, everybody has had pretty good success. Joel & I (& Charles Bailey when he was competing), built rifles around 3.5 inch tubes. Joel now has one using a 5-inch tube. The tube was also the basis for the "stock" in these designs. I don't have a digital camera, so can't really post a picture.

The Holy Grail with the tensioned barrel rifles is they shoot round groups. The group might get a little bigger or smaller, but vertical stringing is gone with any reasonable load. I guess if you loaded them light enough, they might string. Success with this in HG, but hard/impossible to achieve with the Light Guns. We have had some success in that the LG's seem more accurate with a tube (hard to prove, and sample size is small), but less luck with the "no vertical".

Good luck with yours.
 
Dumb question. What is a tensioned bbl?
It would apear the bbl nut would thread on the bbl, compressing against the outer tube and pulling the bbl forward, thus tension??

Is this correct? thank you joe:)
 
jGEE.............Correct! That is exactly what is happening.

My rifle shoots great! As a 300 Ultra Mag it was a serious 500yd gun (That is the logest range I ever got to shoot it at) Since I wasn't planning on any 1000yd shoots I didn't need the recoil and cost of loading the 300UM. So I had a Savage 112 in 243 that was shooting consistent 1/2' groups. I pulled the barrel and put it into the tension tube. I noticed a slight improvement in accuracy, but it might have been the free floating receiver where there is no part of the receiver touching the stock.
I then rechambered this factory Savage barrel to 6mm Rem Ackley. Great improvement! groups in the 3s at 200 yards were common. Again, I'm not sure if the tension had the effect or just a better chamber job that Savage performed.
Now the rifle has a Kreiger barrel in 6BR.............."Bugholes as needed"..:D
No real load development was needed. It basically shoots any 6BR load and bullet into tiny groups. It seems that the whole issue of developing a load to find the harmonics of the barrel are gone.
More bench time is needed and to build one of these is a substantial amount of work, but the results are very promising.
 
Roy,

We are using much thinner walled tubing (.125") for light guns. With a 17 lb weight limit we can't use a tube with a thick wall like the one in your pictures. One of the issues you can run into is the barrel growing at a faster rate than the tube thus loosening tension. This is more an issue with large powder burners when you have to fire in excess of 10 shots in rapid succession. The idea of bedding the tube has merit. Charles has a rifle where we barrel blocked over the tensioning tube and it shoots well.

On a different note, I think you are into motorcycling like myself. I bought a 2006 Ducati ST3S that I think you had an eye for a few months back.

Joel Pendergraft
 
Butch

There is ALWAYS a market for a Ducati. I went to the GP moto race in Laguna Seca last fall. To see Stoner and Rossi duel at impossible speeds was a real thrill. Love Stoner but Rossi is the master. I have a pic of Stoner in a corner with his elbow and knee dragging. Last years Ducati would lift the front wheel at 140 mph when the throttle was opened. Defies the laws of physics. Long live the desmo.

Donald

Sorry about hijacking the thread.:D
 
You're making me jealous! I've been looking for an St3s with ABS for a while......They are quite rare and are still commanding a very high price. I had an ST3 for a while. Wonderful motorcycle!

Did you buy the actual bike I was looking at? The one in Florida?

I just got back from a 400 mile ride today. When I started out the temp was 28 degrees, its a nice, warm 41 right now...........:cool:

I took my heavily modified Suzuki V Strom.............
 
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