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Mar 29th, 2024
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Joined: Aug 2003
Posts: 386 Likes: 1
Sidelock
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OP
Sidelock
Joined: Aug 2003
Posts: 386 Likes: 1 |
Hi, I have the opportunity to buy a 16ga Bill Hanus Birdgun. I think it was made in the 80's.
It is made by Ugartechea and imported through Texas. It is a nice minty gun. The chokes check out, sk1 and sk2. My concern is the chambers. The barrel flats have the 16-70 stamp. When I check the chamber length though, my Galazan bore gauge reads 3 1/4" chambers. The chambers and bores look factory polished with no tool marks. Did Bill Hanus spec these guns with extended forcing cones or was it done aftermarket ?
Thanks , terc
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Joined: Jan 2002
Posts: 5,084 Likes: 35
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 5,084 Likes: 35 |
Forcing cone lengthening wouldn't affect chamber length. You seem to be saying the chambers are 1/2" longer than stamped?
And you're not using a chamber gauge but a bore gauge?
My problem lies in reconciling my gross habits with my net income.
- Errol Flynn
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Joined: Aug 2003
Posts: 386 Likes: 1
Sidelock
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Sidelock
Joined: Aug 2003
Posts: 386 Likes: 1 |
Rob, A Galazan chamber gauge bottoms out at 3 1/4"s. I do have a bore gauge for measuring chokes. When I push it into the chamber the dial shows a constant reduction in diameter until it reaches 3 1/4"s.
Thanks again, terc
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Joined: Jan 2002
Posts: 3,642 Likes: 1
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 3,642 Likes: 1 |
Hello Terc,
Three inches and a quarter are 95.25mm, a whole inch more than stated.
Something seems to be off if the gun is stamped 16-70 (70mm chamber or 2.75").
JC
P.S.: clearly wrong with above statement, 3 and 3/4 inches are 95.25mm
3 and 1/4" are 82.55mm as stated below. Sorry.
Last edited by JayCee; 04/05/17 11:55 AM.
"...it is always advisable to perceive clearly our ignorance."ť Charles Darwin
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Joined: Aug 2003
Posts: 386 Likes: 1
Sidelock
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OP
Sidelock
Joined: Aug 2003
Posts: 386 Likes: 1 |
I did some more measuring after work. Sorry, I should have taken more time this morning. I don't know if this will make a difference or not.
The chambers taper .004"/inch for the first 2 3/4".
At 2 3/4" the taper increases to .024"/inch until my gauge bottoms out at about 4 1/4 ".
Maybe it is just a standard forcing cone job and my flat Galazan gauge is misleading me.
terc
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Joined: Feb 2008
Posts: 518 Likes: 4
Sidelock
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Sidelock
Joined: Feb 2008
Posts: 518 Likes: 4 |
Just so everyone is clear, 3.25 inches is 82.6mm, and a 70mm chamber should measure out about 2.76 in.
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Joined: Dec 2001
Posts: 12,743
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 12,743 |
The .004"/inch is the chamber. The .024"/inch is the forcing cone reducing down to bore size. As the end of the chamber is normally about .070" over nominal bore size of .729" @ .024"/inch it would take near to an additional 3" to reach bore size. The .024"/inch over 1˝" (4Ľ"-2 3/4") would only give .036" reduction or about half the normal amount. What does your bore diameter read?
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Joined: Jan 2002
Posts: 7,703 Likes: 103
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 7,703 Likes: 103 |
Might be more important to measure the minimum barrel thickness where the chamber/forcing cone has been opened or lengthened. The longer chamber shouldn't affect the patterns the gun throws; and as long as the barrel thickness at the chamber is acceptable the gun should be alright even if the chambers have been messed with...Geo
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Joined: Aug 2003
Posts: 386 Likes: 1
Sidelock
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Sidelock
Joined: Aug 2003
Posts: 386 Likes: 1 |
Piper, My gauge only reaches in about 4 1/4". The forcing cone is still tapering at .024"/inch at that point. I'm assuming the taper continues to the the bore. This is a 16ga.
terc
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Joined: Dec 2001
Posts: 1,418 Likes: 2
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 1,418 Likes: 2 |
cant quite remember for sure but think that the Hanus guns came with skeet chokes and lengthened forcing cones.....
gunut
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