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This is a discussion on .44 spl within the Reloading forums, part of the Firearm 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, 08:40 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, 05:53 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 06:16 AM.
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Old February 16th, 2017, 09:09 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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