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Need to know the year, Pawn Shop Single Six

This is a discussion on Need to know the year, Pawn Shop Single Six within the Ruger Single Action forums, part of the Pistol & Revolver Forum category; I stopped into my local Pawn Shop and found this Single Six, 5 1/2 inch barrel, LR 22 cylinder, looks to be in great shape. ...


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Old February 3rd, 2020, 11:22 AM   #1
 
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Need to know the year, Pawn Shop Single Six

I stopped into my local Pawn Shop and found this Single Six, 5 1/2 inch barrel, LR 22 cylinder, looks to be in great shape. No box or paperwork with it.

Picked it up for $370. I think it is a conversion pistol. (7/32 drill bit shank slides in the barrel)


Did not come with the 22 WIN MAG cylinder. Can anyone shed some light on what I have. I think its a 1977 model. Here is the Serial #65-17535.

Thanks,

Steve



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Old February 3rd, 2020, 12:07 PM   #2
 
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Appears you are correct according to the Ruger website:
New Model Single-Six
Includes Bisley Models & 50th Anniversary Model

22 LR, 22 Magnum, 17 HMR (Instruction Manual)
Serial Year
62-00001 1973
62-60261 1974
63-31002 1975
64-22659 1976
64-94851 1977
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Old February 3rd, 2020, 03:42 PM   #3
 
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It fits ...

Quote:
Originally Posted by snblinn View Post
Picked it up for $370. I think it is a conversion pistol. (7/32 drill bit shank slides in the barrel)
7/32" is about .2188". Since both .22 LR and .22 Magnum have a bore of .225" a 7/32" drill bit shank WOULD slide into the bore of a Single Six of either caliber.
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Old February 3rd, 2020, 04:09 PM   #4
 
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Thanks guys.

In 1977 were all 3 variations available, 22LR, 22WMR and Conversion. Or just Conversion models?

Steelburner, I slid the "shank end" of the bit into my 10/22 and old Remington bolt action barrels. It only slid in about 1/2 inch and was very tight.

Slid all the way into the Single Six barrel and has noticeably more wiggle room.

Not sure how scientific that is. I read somewhere that Ruger used the same barrels on 22LR and 22WMR, as a cost/tooling saving.

I think it will be fun to shoot both rounds from the same gun. If I can a cylinder at a good price.

Teach the kids on Low velocity shorts, then LR and step up to 22WMR.
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Old February 3rd, 2020, 05:22 PM   #5
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Steelburner, Not true! I think you are forgetting the rifling. For a normal 22 LR, the distance between grooves is .222 but the distance between the lands is about .217" … just a tad too tight for a 7/32 drill bit shank. A 22 WMR, has a distance between grooves of .224" and the distance between lands is .220" …. just enough where the shank of a 7/32" drill bit will fit in the bore. Try it sometime!

FYI, 22 LR ammo has soft lead bullets …. maybe plated or coated but still plenty soft enough to obturate (expand under pressure) when fired. This means lead bullets will expand in the cylinder throat (.225") with a 22 LRs 24,000 psi chamber pressure then seal pretty well in a Ruger Single-Six .224" rifled bore. Maybe not match grade but still plenty accurate for casual shooting. My S&W Mod 17 is incredibly accurate and has a match grade barrel that pin gauges at .215" (distance between lands) with a true bore diameter of .221" (distance between grooves). There's no way a 7/32" drill bit shank will even start in the bore.

snblinn, Since the introduction of the 22 Magnum Single-Six in 1959 (serial number 150,000) Ruger has used a .224" bore in all their SA 22 cal revolvers to include 22 LR only Single-Sixes, Bisley 22 LR Only Single-Sixes, Bearcats, and of course 22 Convertibles. Many people make a big deal out of the Single-Six's oversized bore but it shoots pretty darn good despite being a couple thousandths too generous. Other manufacturers such as Colt New Frontier and Heritage Rough Rider also use the same .224" bore diameter as Ruger in their SA 22 Convertibles. 22 WRM bullets are jacketed .224" so they need a more generous bore or they would exceed pressure standards and possibly blow up a gun with a 22 LR bore.

Last edited by Iowegan; February 4th, 2020 at 10:07 AM.
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Old February 4th, 2020, 05:17 AM   #6
 
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Thanks Iowegan. This is my first single action and I enjoy learning the design history or provenance of my specific weapon as well as shooting it.
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