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5 members (SKB, buckstix, Skeeterbd, 2 invisible),
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Forums10
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Jul 28th, 2025
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Joined: Feb 2002
Posts: 14,447 Likes: 278
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,447 Likes: 278 |
I don't own one, but Tony's brass gauge works pretty well for chambers. I do it the hard way, with a machinist's scale.
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Joined: Jul 2010
Posts: 707
Sidelock
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Sidelock
Joined: Jul 2010
Posts: 707 |
I was wondering... If someone was frugal, couldn't you obtain wall thickness by using a bore diameter gauge, making notes every half inch, then repeat the process from the outside using a simple dial caliper?
And another question: can someone teach me the right way to measure choke since the galazan tool is imprecise? Can I do it with the other instruments I now know? Can I claim choke based solely on patterning board results?
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Joined: Apr 2002
Posts: 6,812
Sidelock
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Sidelock
Joined: Apr 2002
Posts: 6,812 |
Works in theory but doesn't account for eccentricity of bore to exterior caused by "striking" (filing to finish O.D.). As a matter of verifiable fact, no W/T gauge has access to the area joined by the ribs. If frugality is the aim, Rookhawk, you could money back that brass "ring sizer" to Tony G and measure the differential bore to choke with your Skeets bore mic. If you want to build a better mousetrap like that of James I. ,a simple needle indicator from Harbour Freight is even cheaper than a digi--probably about 15$. Pattern board will sure show you the spread and the usable concentration. Enjoy your new toys!
jack
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Joined: Feb 2002
Posts: 14,447 Likes: 278
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,447 Likes: 278 |
Rook, you measure the choke with the Skeets gauge. Muzzle diameter minus bore diameter equals choke constriction.
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Joined: Feb 2006
Posts: 3,854 Likes: 118
Sidelock
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Sidelock
Joined: Feb 2006
Posts: 3,854 Likes: 118 |
I agree with Jack, send the Galazan gage back and use the Skeet's gage. In doing the choke, to me it is easier that once the indicator is zeroed to the .700 ring, insert into barrel, read bore size to full length (11 1/2" on mine) and then reset to zero and with-draw and read choke. Easy to see what difference there is.(Bill doesn't approve of this method)
Also the Skeet's will measure 16 ga. But if you do not have a ring gage to go by it is easy to get confused by subtracting the bores form the dial. Also some earlier 16 ga. were .650 bore and later were .662. I know this is true for L.C. Smith's but not sure of others.
In measuring the .650 bores will be tough because the brass head is .625 and so the balls are almost into the head and will not fit into the bore with any choke.
David
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Joined: Jan 2002
Posts: 11,571 Likes: 165
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 11,571 Likes: 165 |
I agree with eightbore. The Galazan chamber gauge is a handy tool. The drop-in brass choke gauge only works if the bore diameter is standard. Especially in foreign guns, it's often a good bit off standard, so you get a false reading.
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Joined: Apr 2002
Posts: 6,812
Sidelock
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Sidelock
Joined: Apr 2002
Posts: 6,812 |
I agree with JD as he agrees with jr. "Handy" Larry? There's a "test tube" rack at our club skeet range with about three of these step gauges. Galazan didn't invent the darn things. I think ours were turned by Brent Warner. The skeet "Nazi" doesn't understand; he wants to stick the damn things in every barrel that comes down the pike. Repeat after me: .729" is fine (and appropriate diameters for other gauges)" but it's not mine.
The phrase that clears out the confusion (except for the skeet Nazi)is "points of constriction". Constriction is getting tighter as in "choking". Points is thousandths of an inch. Constriction is ALWAYS measured relative to the major bore diameter. It does not yield an ABSOLUTE measurement wall to wall in the choke area! Those who persist in Ass U Me-ing otherwise are tedious in their refusal to learn. The I.D. of your choked area is X thousandths less than the I.D. of your bore. That's the bore of a particular barrel of YOUR gun; not someone else's gun or an accepted standard ("nominal" bore size for a particular gauge.
jack
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Joined: Nov 2005
Posts: 1,274 Likes: 1
Sidelock
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Sidelock
Joined: Nov 2005
Posts: 1,274 Likes: 1 |
The book refered to above is The Standard Directory of Proofmarks and is available from Amazon for 16.00
http://www.amazon.com/s/ref=nb_sb_ss_i_0_37?url=search-alias%3Dstripbooks&field-keywords=the+standard+directory+of+proof+marks&sprefix=the+standard+directory+of+proof+marks
I learn something every day, and a lot of times it's that what I learned the day before was wrong
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Joined: Feb 2002
Posts: 14,447 Likes: 278
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 14,447 Likes: 278 |
I know this is an old thread, but we didn't answer JDW's last question. It doesn't matter what the bore diameter is, you use the .700 ring on the Skeet's or Galazan micrometer to zero your micrometer and determine the bore and choke of your 16 or 12 gauge based on the .700 base figure. Again, the difference between the bore and the choke at the muzzle is the choke dimension. When you are buying an expensive gun and originality is your goal, you have to know what "original" is and what your prospective purchase measures. Rookhawk will pay for his gauges on his first purchase. He has bought the right tools without paying an exorbitant price.
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