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Old 12-13-2010, 08:20 AM   #1
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Head Space Issues

What problems can one expect from too little head space on a Smith .357 revolver? If there is little to no drag problem with case heads what can be expected as other problems?
 
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Old 12-13-2010, 09:36 AM   #2
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Quote:
Originally Posted by Bennon View Post
What problems can one expect from too little head space on a Smith .357 revolver? If there is little to no drag problem with case heads what can be expected as other problems?
Too little and you can't close a cylinder, turn the cylinder, or have binding. Proper specs for a rim should be(if I remember right) .048-.059? Head space should be .060-.074.

If the HS is within tolerances and your not getting drag/casehead scratching, that part should be ok. What you need to measure now is your cylinder/forcing cone gap. Make sure that is within tolerances.


I am not a smith. Just my memory and shooting years here.
 
Old 12-13-2010, 11:30 AM   #3
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Thanks! I measured the headspace on all six chambers and all but two ran .006 to .007 measured from a chambered case head.I had two that measured .003 inches and that concerns me.
 
 
Old 12-13-2010, 11:53 AM   #4
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Quote:
Originally Posted by Bennon View Post
Thanks! I measured the headspace on all six chambers and all but two ran .006 to .007 measured from a chambered case head.I had two that measured .003 inches and that concerns me.
Measure from rear of the empty cylinder where caserim would contact to the flatest section of recoil shield/breachface. THATS HEADSPACE!

The .006-.007 with inserted case is acceptable. The ones that are .003 would be tight and I would prefer it alittle higher. Maybe someone with more knowledge than me can jump in.

Last edited by Sarge405; 12-13-2010 at 12:03 PM.
 
Old 12-13-2010, 12:07 PM   #5
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Yes I am aware of that but when I am using a particular brand of brass I measure using the method shown in Kuhnhausen.That gives me six surfaces that are easy to measure and really relate to revolver operation.
 
Old 12-13-2010, 04:21 PM   #6
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When double action revolver head space varies, the first question is, are the suspect chambers next to each other?

If they are, you're very likely looking at a bent or sprung cylinder yoke.
This can cause cylinder binding or stiff rotation, and the cylinder contacting the rear of the barrel in extreme cases.
Binding will usually be only on two or three chambers.
 
Old 12-14-2010, 06:30 AM   #7
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Could that cause primers to extrude toward the recoil shield and lock up the revolver?
 
Old 12-14-2010, 03:45 PM   #8
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Possibly.
The usual cause of primer extrusion is ammo too hot, less often a physical problem with the gun.

My recommendation is not to spend too much time on this.
Unless you're a trained pistolsmith, it's likely not something you'll be able to properly diagnose or repair.
This is the sort of problem you should send in to the company for the experts to diagnose and repair.
 
Old 12-15-2010, 05:47 AM   #9
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dfariswheel,

Can't PM you so I'll do it here. Hope you don't mind or Bennon.

Can't thank you enough for the help and service you provide. As you know I am NOT a gunsmith, never stayed at a Holiday Inn. I try to post regularly as possible to keep the board active and strong. Sometimes all of us are busy and don't check in quckly and posts go unanswered. I just don't like that. Members then leave. So I try. But you are among the few who come in and set us all straight. THANKS!
 
Old 12-15-2010, 07:10 AM   #10
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I agree Sarge,it is good to have someone around who will in a proper manner answer your questions and help you.I hate to do it but I guess the gun goes back to S&W.

Oh,by the by,the ammo that is giving me fits is standard factory .357 with 158 grain bullets.If I reload ammo and shoot +p 38's the gun does fine.

Last edited by Bennon; 12-15-2010 at 07:12 AM.
 
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