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PostPosted: Wed May 08, 2019 7:32 pm 
Hawkeye

Joined: Wed Oct 24, 2007 3:17 pm
Posts: 17449
Location: Kentucky
Yes, but we're not measuring at the root of the grooves, we are measuring the "clear bore" at the tips of the lands. These measure .219" for the magnum barrels and .217" for the LR barrels.

A 7/32" bit is .2187" and will JUST slip into the magnum bore but NOT into the LR bore.

This has worked just fine for me for, oh, fifty years or so, but do whatever you like.

And I did double-check this with iowegan, if anyone cares.

:mrgreen:

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PostPosted: Wed May 08, 2019 7:37 pm 
Buckeye

Joined: Mon Aug 25, 2008 6:59 pm
Posts: 1192
Location: S Florida
Yes, there is a difference between bore diameter and groove diameter. :roll:

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PostPosted: Thu May 09, 2019 3:50 pm 
Hawkeye

Joined: Fri Apr 03, 2009 7:01 pm
Posts: 7090
Location: People's Republik of Kalifornia
Ale-8(1) wrote:
Yes, but we're not measuring at the root of the grooves, we are measuring the "clear bore" at the tips of the lands. These measure .219" for the magnum barrels and .217" for the LR barrels.

A 7/32" bit is .2187" and will JUST slip into the magnum bore but NOT into the LR bore.
:mrgreen:


Ale,

True we're not measuring the groove diameter with the drill bit; actually can't measure it that way. The bore is the diameter between the top of the lands.

Try a #2 (.221") drill bit in your .22 Magnum barrel just for sake of discussion.

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PostPosted: Thu May 09, 2019 4:33 pm 
Hawkeye

Joined: Wed Oct 24, 2007 3:17 pm
Posts: 17449
Location: Kentucky
Hondo44 wrote:
Ale-8(1) wrote:
Yes, but we're not measuring at the root of the grooves, we are measuring the "clear bore" at the tips of the lands. These measure .219" for the magnum barrels and .217" for the LR barrels.

A 7/32" bit is .2187" and will JUST slip into the magnum bore but NOT into the LR bore.
:mrgreen:


Ale,

True we're not measuring the groove diameter with the drill bit; actually can't measure it that way. The bore is the diameter between the top of the lands.

Try a #2 (.221") drill bit in your .22 Magnum barrel just for sake of discussion.



Hondo, that's exactly what I said.

I don't happen to have a #2 bit, and I don't need one to make the quick check we are both talking about . . . the 7/32" bit works quite nicely.

:mrgreen:

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PostPosted: Fri May 10, 2019 10:54 am 
Newly Registered

Joined: Thu Jun 18, 2015 2:48 pm
Posts: 14
Dave Celemets' wait list is moving into next year. I just put my Bearcat in line for a .22 Mag conversion.


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PostPosted: Wed May 15, 2019 7:41 pm 
Buckeye

Joined: Wed Oct 27, 2004 1:01 am
Posts: 1183
Location: Southwest VA USA
I was able to just slip the twist end of a #2 drill bit into the muzzle of my Bearcat. I should be good to go for magnum ammo. I got another cylinder from a forum member. Now I need to rent a reamer and get this project done. :)


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PostPosted: Thu May 16, 2019 11:30 am 
Hawkeye

Joined: Wed Oct 24, 2007 3:17 pm
Posts: 17449
Location: Kentucky
If it were me, I'd carefully check the shank on that #2 bit with a mic. Why do this? Just to be sure we're all on the same page. I do know for certain that some inexpensive drill bits can be "less than perfect".

JMHO :wink:

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PostPosted: Thu May 16, 2019 9:36 pm 
Hawkeye

Joined: Fri Apr 03, 2009 7:01 pm
Posts: 7090
Location: People's Republik of Kalifornia
Muley Gil wrote:
I was able to just slip the twist end of a #2 drill bit into the muzzle of my Bearcat. I should be good to go for magnum ammo. I got another cylinder from a forum member. Now I need to rent a reamer and get this project done. :)


Bravo, anxious to hear how happy you are with it!

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PostPosted: Sun May 19, 2019 12:36 pm 
Single-Sixer

Joined: Mon Oct 10, 2016 10:33 pm
Posts: 457
Location: Derby City KY.
There are some beautiful Bearcat .22 revolvers posted here.

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PostPosted: Mon May 20, 2019 7:52 pm 
Blackhawk
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Joined: Thu Feb 22, 2007 2:01 am
Posts: 952
Location: Round Rock, Texas
Here is my new Bearcat. It will remain as a .22lr. 8)

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PostPosted: Tue May 21, 2019 2:19 am 
Hawkeye

Joined: Fri Apr 03, 2009 7:01 pm
Posts: 7090
Location: People's Republik of Kalifornia
Armybrat,

That's nice, still has the 4" barrel.

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PostPosted: Tue May 21, 2019 6:31 am 
Blackhawk
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Joined: Thu Feb 22, 2007 2:01 am
Posts: 952
Location: Round Rock, Texas
Hondo44 wrote:
Armybrat,

That's nice, still has the 4" barrel.

Actually it is a 3.5” barrel.

Oddly enough, the stainless Shopkeeper barrel is 3” according to the catalog. Who knows why the difference?


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PostPosted: Tue May 21, 2019 7:15 am 
Blackhawk

Joined: Wed Apr 30, 2008 5:06 am
Posts: 503
Armybrat wrote:
Hondo44 wrote:
Armybrat,

That's nice, still has the 4" barrel.

Actually it is a 3.5” barrel.

Oddly enough, the stainless Shopkeeper barrel is 3” according to the catalog. Who knows why the difference?

Seems folks with the ss 3” have to pick out the empties,the extra 1/2” in blue solves that. I’m waiting for the unfluted 3 1/2” in stainless!!


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PostPosted: Tue May 21, 2019 7:56 am 
Blackhawk
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Joined: Thu Feb 22, 2007 2:01 am
Posts: 952
Location: Round Rock, Texas
I’d like one of those too.


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PostPosted: Tue May 21, 2019 4:59 pm 
Hunter

Joined: Sat Nov 14, 2015 7:06 pm
Posts: 2525
Location: Kansas City, MO
Hondo44 wrote:
The Long Rifle bore (diameter of the lands) is .222"; the WMR is .224".

A #2 drill is .221" at the cutting end and a more accurate test. And check your drill bit with a dial caliper or a micrometer. Recognize the shank of the drill bit is smaller than the actual cutting edges, so use the cutting end of a new drill.

The 7/32" (.219") drill bit is too small to discern the difference in bore sizes. It will enter a clean .222" bore.

Bearcats were introduced in 1958 so those produced before 1960 likely have LR only bores; #s A001 thru X453, and possibly later. I don't have one that early to confirm.

Super Bearcats introduced 1970 (all steel except trigger guard until 1973) all have the .224" bore.

The Single Six LR only .222" bores ended at ~ #150,000 in 1959.

All Lightweight Single Sixes have .222" bores thru #212,530 when they ended production in 1959. The S (seconds) model Lightweights assembled in 8/64 and 4/65 are all numbered below #212,530 and may have either bore because they were assembled later.
. Jim, I wish you were closer, I have an Alpha Cat you could measure bore. I really want a .22 M in a Bearcat. I handled a Wrangler, bronze finish. Then dealer layed a 1959 Single Six Magnum on glass counter. I bought the 1959 Ruger. I would rather have the early Rugers, they all shoot great for me. Character, with a solid feel.


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