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PostPosted: Sat Aug 06, 2011 10:26 pm 
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Bearcat

Joined: Sat Aug 06, 2011 10:20 pm
Posts: 3
Location: Southern Minnesota
I have a Ruger Security Six with a 6" barrel. The barrel cylinder gap measures .007" when a gaap of .003" would be much more desirable.

What can be done to tighten up this gap?


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PostPosted: Sun Aug 07, 2011 1:09 am 
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Hunter

Joined: Fri Apr 03, 2009 7:01 pm
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I don't think Ruger would correct it on their dime as it's within a reasonable tolerance. But a phone call to them might be worth it, you never know and they have great service.

The only corrective measure is to turn the barrel in another full revolution after relieving the shoulder on a lathe, then resetting the gap and rethroating the barrel. Probably $200 worth of work at least for a very minor issue if the gun functions properly as is.

Plan B is find another gun with a more acceptable gap to you and sell it.

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PostPosted: Sun Aug 07, 2011 6:18 am 
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Buckeye
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Howdy

I'm curious why you think .007 is too much of a gap. I have many, many revolvers, most of them have gaps between .005 and .008. They all shoot just fine. I do have a few with gaps as small as .003, but I don't really see any problem with a gap a little bit larger. As a matter of fact I have one antique S&W, made in 1881, that has a gap around .012, because the frame was stretched by shooting too many Smokeless rounds in it. I was a bit concerned when I saw how large the gap is, but it shoots just fine too.

Hondo44 is correct. The standard way to tighten up the gap is to turn the barrel in one more thread. Doing this requires relieving the shoulder by the amount of one thread, so that the barrel can be turned in. Then, the barrel is trimmed back the amount needed to get the desired gap. I doubt Ruger will do it for you, you will have to find a gunsmith to do it, and frankly, I don't see the need.

P.S. Don't forget, the proper way to measure the gap is with the cylinder pushed as far as possible to the front. If there is any endshake (front to back play of the cylinder) measuring the gap with the cylinder pushed back will give an erroneous reading of barrel/cylinder gap.


Last edited by Driftwood Johnson on Sun Aug 07, 2011 6:37 am, edited 1 time in total.

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PostPosted: Sun Aug 07, 2011 6:28 am 
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Hawkeye

Joined: Sat Mar 19, 2005 2:01 am
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Location: Duxbury, Vermont, USA
Send it to one of the many competent professionals who have Ruger skills.

AP&W
C&S
Ten-Ring
Bowen
MagnPort
SSK
others....

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PostPosted: Sun Aug 07, 2011 7:08 am 
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Buckeye
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Location: Glassport, Pa
I'm happy with a .007 gap. I don't think there is much differrence in velocity, and too tight of a gap could cause binding if excess lead and powder residue were to build up.


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PostPosted: Sun Aug 07, 2011 7:35 am 
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Buckeye

Joined: Fri Jun 19, 2009 8:44 pm
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Location: Pennsylvania
Just to be sure we're clear on measurement of cylinder to barrel gap: push cylinder forward to measure minimum clearance (.003" min spec) and push cylinder back to measure maximum clearance (.008" is listed as max spec). Also, measure from both sides of frame.

I have read that the six series typically came from factory with .004" to .006" measurements.

I have had problems when I've had revolvers set to .003", and I've needed it opened up a bit. I personally wouldn't worry about 0.007", as fixing it is rather expensive and involved.


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PostPosted: Sun Aug 07, 2011 7:44 am 
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Hawkeye

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Location: Duxbury, Vermont, USA
(Me, either; I ask "How does it shoot?").

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PostPosted: Sun Aug 07, 2011 9:31 am 
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Bearcat

Joined: Sat Aug 06, 2011 10:20 pm
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Location: Southern Minnesota
The gun shoots fine. I was just interested in how difficult it would be to tighten it up if I was inclined to do so.


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PostPosted: Sun Aug 07, 2011 10:06 am 
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Site Admin
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Location: Star Valley, WY
My F-A's have B/C gaps in the 0.001"-0.002" range. Never a problem no matter how many times I've fired them w/o cleaning.

flatgate


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PostPosted: Sun Aug 07, 2011 11:09 am 
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Buckeye

Joined: Fri Jun 19, 2009 8:44 pm
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Location: Pennsylvania
I have similar experience with my FA single actions, and in fact I just had a Ruger Blackhawk set up with minimum clearance and it measures a little under .002 - and it works fine so far.

My problem with the .003" clearance was on a double action Security Six .357 mag. I had problems when shooting rapid fire exercises and the cylinder got hot from firing. Just thermal expansion will cause the gap to close by .002" or so if I recall correctly.


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PostPosted: Sun Aug 07, 2011 1:24 pm 
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Single-Sixer

Joined: Sat Dec 13, 2008 9:24 pm
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If the gun shoots fine, I cant imagine why on earth you would care about the cylinder gap. Shoot the hell out of it and send back to Ruger if you have any actual issues with it. I've only ever had to send one revolver back to Ruger in over 25 years of shooting them. Enjoy.

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PostPosted: Sun Aug 07, 2011 1:25 pm 
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Single-Sixer

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Location: Washington State - Wet Side
...Oh yeah, and Ruger is a pleasure to deal with. First rate customer service as far as my experiences go.

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PostPosted: Sun Aug 07, 2011 2:14 pm 
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Single-Sixer

Joined: Thu Apr 22, 2010 4:40 pm
Posts: 367
Over in S&W land b-c gap tolerances are said to be .004" minimum & .010" maximum. Since I'm primarily a DA shooter, I prefer b-c gaps to not be under .005" on DA revolvers because with tighter gaps a smidgen of leading or unburnt powder can add unpredictable drag to the DA pull. That drag would go unnoticed thumb cocking so teeny weenie gaps on SAs are fine with me. But for DA revolvers, because, even though our best developed cast bullet hand loads don't lead, not all the ammo we assemble turns out to be ideal and factory cartridges with swaged lead bullets ordinarily lead some. I think shooters focus on b-c gaps too much simply because they are so easy to measure, and I've found gaps up to .010" make no noticeable difference.


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PostPosted: Mon Aug 08, 2011 11:39 am 
I've always understood B/C gaps were measured with cylinder pulled back????

Anyhow, I sent my Single-Six back to Ruger because it was spitting out of the sides. Gander Mtn. smith said gap was .011", Gander returned it for me. Ruger tech on phone later said Ruger's standard was .005-.010, but most turn out as .005-.007. I believe he meant all Rugers, not just the S-S.

Gun was returned (9 days) with invoice marked that it was rebarreled, with new pawl and frame screws, so they apparently thought timing was off, too.The gap measures just over .004 (both cylinders) now, my Bearcats are both about .005.


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PostPosted: Mon Aug 08, 2011 11:59 am 
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Hawkeye
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flatgate wrote:
My F-A's have B/C gaps in the 0.001"-0.002" range. Never a problem no matter how many times I've fired them w/o cleaning.

flatgate


10X Carl, not as much space for the powder crud to gather and gum things up IMHO....And according to Linebaugh, as much as 100 fps can be achieved with no other change than tightening up a fat B/C gap with his kind of loads in a .45LC... :wink:

John Linebaugh:

"If a particular gun showed sluggish signs we went from a .452 dia slug to a .454 thus creating more resistance, and better seal in the throats of the cylinder. We soon learned that TOLERANCES were very important. We started with setting back the barrels a thread and closing the barrel/cylinder gap to under .002 instead of the common factory gap of .006 plus. This alone can boost velocity over 100 fps without changing the load. We next went to smaller chambers and .454 chamber throats. This combination with a proper size .451 barrel and tight .002 cylinder gap made the .45 Colt more than we could ever hope for".

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