barrel stub

[pondenck]

 i  have a barrel stub i am working on want to bore out 950 would it be safe to do so. its only bored 1\4 inch at 950 rest is 800. Thanks for any help Jim

[jedman]

  I think that is too large of a ID for a stub.  You would only have about .075 wall thickness and if you plan to thread it , there would be little strength left to support the barrel.
Is there a reason you were going to bore it that large ? Im sure others will chime in on this also, but I would go no farther with it until you have a good plan in place.      Jedman

[pondenck]

 I was going to do one like larrys.but did not like the barrel band .

[dangerranger]

my understanding of Larry's [Trotterleg] project was that the stub was only a bracket to hold it on the completed rifle. the barrel itself provided the strength. so in that way the stub only has to be strong enough to hold the barrel up and provide a recoil lug. it will be intresting to see others take on this. DR

[dangerranger]

I was going to do one like larrys.but did not like the barrel band .

Im wondering if you ment that the barrel will have a flange at the breech and a securing nut at the front of the stub? DR

[quickdtoo]

The stub must also withstand the breech thrust which can be substantial on high pressure chamberings, I would think wall thickness on an 1137 mild steel shotgun barrel would be more critical than a 4140 rifle barrel.

Tim

[pondenck]

 I was going to use a barrel nut at one time.but dont want to now want to thread stub.i hope 950 is not to big. Thanks for all help the keep it comeing. Jim

[jedman]

 pondenck,  What  cartridge were you thinking of chambering this stub prodject in ?
If you alreandy have it bored to .950 my recomendation would be to solder your barrel into the stub with a hi strength solder.
I built a SxS double rifle from a 12 ga. stub and soldered the barrels into the stub and it has been shotin ever since , ( more than 20 years )
If your stub is approximately 3 1/2 inches long with a bore of .950 you would have near 10.5 sq. inches of bonding surface, more than enough for most chamberings.
I have a handi barrel built from a stub with a 338 cal. wildcat barrel that I silver soldered in with a dia. of about .850 thru the stub.       Jedman

[trotterlg]

You don't say what barrel you are putting on it, but I would bore the breach about a half inch deep do about .975, leave the rest at 800 and then turn the barrel to .800 leaving a sholder where the front of the stub meets the barrel.  If the barrel is too small, turn it to 800 all the way through the stub and thread on a nut from the breach end, this is how I did the last 25-35 barrel, then make a nut with the OD of about .970 with threads in it for the .800 barrel, screw it all together and you will be all set.  Larry

[peternap]

The stub must also withstand the breech thrust which can be substantial on high pressure chamberings, I would think wall thickness on an 1137 mild steel shotgun barrel would be more critical than a 4140 rifle barrel.

Tim

Actually, there are three major stress areas. The first is the chamber presssure and the stub won't be an issue there.

The second is breech thrust:
Diameter of head of the cartridge 2, squared, times pi, times operating pressure.

The third is almost impossible to calculate but is still a major factor.
That's the reverse thrust of the projectile going down the barrel.

[pondenck]

 I want to build 17 ackley bee on it.still hope it will turn out. Jim

[trotterlg]

I think it should work out real well, have fun and post some pictures.  Larry