Author Topic: safe vent size?  (Read 11137 times)

Offline JDK

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Re: safe vent size?
« Reply #25 on: February 03, 2012, 12:31:02 AM »
Green Mountain uses a different steel than Douglass.
J.D. Kerstetter

Vomitus

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Re: safe vent size?
« Reply #26 on: February 03, 2012, 12:49:57 AM »
    Are all 12L14 barrels the same quality?

roundball

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Re: safe vent size?
« Reply #27 on: February 03, 2012, 12:56:35 AM »
Green Mountain uses a different steel than Douglass.

What about the barrel steel Rice uses ?


<snip>  13/16" available in .32, .36, .40, and .45 caliber


Offline Hudnut

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Re: safe vent size?
« Reply #28 on: February 03, 2012, 01:25:24 AM »
One of the numerous areas of concern with the leaded steels is poor performance in the Charpy Notch test.  This is particularly relevant when sight and lug dovetails are considered.  Cold temperatures aggravate this.
At a glance, 1144 Stressproof looks to be a very strong steel, but is a poor choice for barrels.
Ductility is very important in a barrel.
I lived for thirty years in the Arctic, ran a little gunsmithing shop.  Firearms there do get used in conditions of extreme cold.  I do not recall ever seeing a barrel which failed unless there was an obstruction.  But when a plugged barrel did fail in the cold, the results could be spectacular.  Split end to end, or pieces blown out.  One .30-06 Parker Hale barrel, fired with snow in the muzzle at -40, shattered into 7 pieces.  There was nothing left in front of the receiver ring.  A .22 rimfire rifle (leaded steel) blew out a piece about 3" long.

Dave Waters

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Re: safe vent size?
« Reply #29 on: February 03, 2012, 01:37:46 AM »
Dose any one know if those previously mentioned ML barrels that blew up were loaded properly? I.E. ball down on powder, etc.?
« Last Edit: February 03, 2012, 01:39:56 AM by Dave Waters »

greybeard

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Re: safe vent size?
« Reply #30 on: February 03, 2012, 04:10:30 AM »
Dose any one know if those previously mentioned ML barrels that blew up were loaded properly? I.E. ball down on powder, etc.?
Now thats the $64,000.00 question.  It being human nature to deny something that could be embaressing. I'm jest sayin you know!!
      Bob Reader

Dogshirt

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Re: safe vent size?
« Reply #31 on: February 03, 2012, 04:24:06 AM »
Dose any one know if those previously mentioned ML barrels that blew up were loaded properly? I.E. ball down on powder, etc.?
Now thats the $64,000.00 question.  It being human nature to deny something that could be embaressing. I'm jest sayin you know!!
      Bob Reader


Yes, we as humans have a HUGE  tendency to OVER think these things! ANY  day is a good day to die! HOKA HEY!
« Last Edit: February 03, 2012, 04:37:36 AM by Dogshirt »

Offline Dphariss

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Re: safe vent size?
« Reply #32 on: February 03, 2012, 06:17:48 AM »
Dose any one know if those previously mentioned ML barrels that blew up were loaded properly? I.E. ball down on powder, etc.?
Now thats the $64,000.00 question.  It being human nature to deny something that could be embaressing. I'm jest sayin you know!!
      Bob Reader

The one I looked at was loaded with 60 grains of power and one ball. First shot from a new barrel IIRC. The man who showed me the barrel is now gone. 60 grains was a very common load for 45s and still is.

The steel in question is not suitable for gun barrels and no amount of "was it loaded correctly?" will change that.
Spaced ball? IIRC the 58 caliber Springfield rifle musket was proved with 280 gr of musket powder and a mine-ball spaced 2" off the powder. These barrels were skelp welded iron.
When the barrel splits from the breech to near the rear sight its hardly a short started ball.
When it splits with no significant deformation it is an indicator that there is a problem with the steel.
Likely it split at a flaw caused by the high levels of lead, sulfur and other lubricant metals that besides introducing  flaws make the steel brittle. Being cold rolled does nothing but make this worse.
But it sure cuts clean and it files easy for the same reason. Its designed to machine easy. But its no meant for gun barrels.
I prefer a steel that is tougher and harder to file.

Older 38 special revolvers have soft steel barrels and small shank barrels. Shooting hot handloads will bulge the thin forcing cone so far as to jam the cylinder. But it didn't split. Significant deformation, no split or fragmentation. Good barrel steel. Still a pretty nice old S&W then needed a new barrel.

Dan
He who dares not offend cannot be honest. Thomas Paine