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.44 spl

This is a discussion on .44 spl within the Ruger Single Action forums, part of the Pistol & Revolver Forum category; How many and what size plug gages would I need to size several .44 spls. Do I need plus or minus's. Where is a good ...


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Old February 15th, 2017, 07:40 PM   #1
 
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.44 spl

How many and what size plug gages would I need to size several .44 spls. Do I need plus or minus's. Where is a good source of supply? Thanks



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Old February 16th, 2017, 04:53 AM   #2
 
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Starting with the plus or minus question; the minus pin gauges are slightly smaller than their marked diameter (usually by about .0002") so if a minus gauge fits and the next larger diameter doesn't - you know the hole falls within those tolerances. If you have both the plus and minus gauges you can use them as a go/ no go set with a known tolerance of about .0002".

In common practice that level of tolerance isn't needed and just the minus gauges will get you within the range you need. If the minus gauge just fits and the next larger minus gauge doesn't fit, you are within the difference between the gauges, usually about .001" ; AND THAT'S GOOD ENOUGH

Now for the number of pins. A 44 caliper revolver is dealing with the diameter of .429" but then we get into groove diameter, bore diameter, throat diameter and we need to have enough pins to measure the possible diameters involved. Obviously we can't measure groove diameter with pin gauges but we can measure throats and bore diameters. The SAAMI specs for the 44 Special throat is .4325" and the bore diameter spec is .417".
So using that as a starting point and only needing gauges for the throats; I would say that a set of minus gauges starting at .428" and going up to .434" should cover your needs. If you want to get pin gauges to measure the bore, you're going to need to add a few more pins to get down to .417"
Personally I would just slug the bore and measure the slug with a micrometer (which gives you the groove diameter not the bore diameter).

Hope that helps.

Last edited by Petrol and Powder; February 16th, 2017 at 05:16 AM.
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Old February 16th, 2017, 08:09 AM   #3
 
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I think Petrol and Powder covered everything but the source. Brownell's has a full line of gunsmithing tools and is the go to source for everything gun related.
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Old February 26th, 2017, 05:15 PM   #4
 
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.44 spl.

want to measure some .44s cylinders and barrels. how many plug gauges, what size, and where do I get them?
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Old February 26th, 2017, 05:25 PM   #5
 
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.44 spl.

thanks, Petrol and Powder. just what I needed to hear. I'm having a hard time learning to use this forum. I'll keep reading. Been shooting Rugers sixty years, using computers about five.
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Old February 26th, 2017, 08:52 PM   #6
 
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You'll want .428' thru .431".

Brownells or Midway

Last edited by Hondo44; February 27th, 2017 at 11:11 PM.
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Old February 27th, 2017, 03:19 AM   #7
 
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Didn't we just go through this topic?

http://rugerforum.net/reloading/238617-44-spl.html
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Old February 27th, 2017, 03:42 AM   #8
 
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You don't need this many pins but just a quick check on the internet yielded a set on Amazon for $70.00 that had pins from .251"-.500"

You could probably find a better price if you spent a little time searching.

You cannot measure the groove diameter of a barrel with a pin gage. To get the groove diameter you must slug the barrel and measure the slug.

Last edited by Petrol and Powder; February 27th, 2017 at 03:53 AM.
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Old February 27th, 2017, 11:19 PM   #9
 
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Quote:
Originally Posted by Petrol and Powder View Post
Personally I would just slug the bore and measure the slug with a micrometer (which gives you the groove diameter not the bore diameter).

Hope that helps.
Quote:
Originally Posted by leakey 77 View Post
want to measure some .44s cylinders and barrels. how many plug gauges, what size, and where do I get them?
I would not buy more pin gauges to measure barrel bores.

As much as I dislike it, I have to respectfully disagree with Petrol and Powder above:

Slugging the barrel will provide both bore and groove diameters very simply.
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Old February 28th, 2017, 03:58 AM   #10
 
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Hondo44, driving a slightly oversized soft lead slug through the barrel will produce a slug that is a reverse image of the bore. If you measure across the raised portions of that slug with a micrometer you will get the groove diameter of the barrel. I suppose if the lands in the barrel were far enough apart and the bore was large enough, one could also get the anvil of the micrometer between the raised portions of the slug and get the bore diameter as well. The same could be done with a caliper but with a lessor degree of accuracy.
However, a steel pin gage cannot be used to determine the groove diameter because the steel pin cannot deform to reach the bottom of the grooves. Therefore a steel pin can be used to determine the diameter of the bore (or at least the most restrictive section of the bore) but it cannot be used to find the groove diameter.

Since you must slug the barrel to obtain the groove diameter and the groove diameter is the more useful of those two measurements (groove & bore), why not just slug the barrel and just obtain the groove diameter?

So I think we're in agreement that purchasing more pin gages just to measure the bore diameter of the barrel is probably unnecessary and a waste of money.

I don't know if one could buy just a handful of pin gages from about .428" -.433" for less money than a full set. If that's possible then that's another option.

I think buying pin gages to measure just the throats is sufficient. Of course you could also just slug the cylinder throats as well and measure those slugs to get the throat diameter (Remove the cylinder and properly support it before attempting that ! )
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