November
S M T W T F S
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
Who's Online Now
3 members (graybeardtmm3, eddie k, 1 invisible), 242 guests, and 2 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums10
Topics39,071
Posts552,335
Members14,477
Most Online1,344
Apr 29th, 2024
Previous Thread
Next Thread
Print Thread
Page 1 of 2 1 2
Joined: Nov 2015
Posts: 1,130
Likes: 19
Sidelock
**
OP Offline
Sidelock
**

Joined: Nov 2015
Posts: 1,130
Likes: 19
Just a quick question for the masses, would a nitro reproof Damascus barrel measured at 18.8 mm make you nervous about purchasing. .740 is quite the jump from .729 or 8.
[Linked Image from i.ibb.co]

Joined: Dec 2001
Posts: 7,121
Likes: 482
SKB Online Content
Sidelock
***
Online Content
Sidelock
***

Joined: Dec 2001
Posts: 7,121
Likes: 482
Without knowing the wall thickness it is hard to say, .740" would be a loss of .0055" per side if the gun started out at .729". If the walls were .030" plus to start, then no worries. If it was struck up thin originally, and many were, then it may be of concern.


http://www.bertramandco.com/
Booking African hunts, firearms import services

I miss Monkey Jim.
Joined: Aug 2013
Posts: 672
Likes: 55
Sidelock
*
Offline
Sidelock
*

Joined: Aug 2013
Posts: 672
Likes: 55
I would certainly want to know the actual current measured wall thickness before purchasing. But, for a bizarre illustration of dimensions, I had an 1879-ish Greener hammer gun that was proved at 12 and then presumably imported to the US near the time of manufacture. In the intervening 100 plus years the bores were enlarged to .783 i.e. 10 gauge with 10 gauge 2 7/8 chambers. However, the MWT in the distal third of the barrels was about .021 and it had approximately .110 at the forcing cone. Must have had a lot of wall thickness to begin with...

Also, what's it weigh? I would think something over or approaching 7 pounds with otherwise normal game gun dimensions might have slightly thicker barrels. Again, I would rather have the measurements or pay what it would be worth presuming the necessity of sleeving.

Last edited by Dan S. W.; 08/10/22 06:56 PM.
Joined: Dec 2001
Posts: 3,969
Likes: 97
Sidelock
**
Offline
Sidelock
**

Joined: Dec 2001
Posts: 3,969
Likes: 97
Agree with Dan. Current .740 is nothing to worry about—just an over bored 12. Heck, I have some totally original Parker’s with bores at or even greater than that. But wall thickness is everything. I see it still has original 2 1/2” chambers—that’s good. But what is wall thickness in front of forcing cone? And on down the bore? A lot of guns will pass proof with very thin barrels on down towards muzzle but be aware that they dent very easily and there’s not much metal remaining to repair.


John McCain is my war hero.
Joined: Mar 2002
Posts: 7,812
Likes: 575
Sidelock
**
Offline
Sidelock
**

Joined: Mar 2002
Posts: 7,812
Likes: 575
.740-.729= .011. Had it been just .002 less it would not have needed reproofing. Any alteration greater than .010" requires reproof. Also recall that .011/2= .0055 wall removal. So if the walls were .035 to begin with they are now .0295. You do not know what they started out as so the need to measure is very much the only real way to know. Also that proof measurement is taken at 9" so at that point it has had .011 removed. You do not know if more has been removed elsewhere. Again measure the wall thickness for the barrels from end to end.

.740 wold not bother me in the least, if the walls are still .025" or greater. I would get more concerned if the walls are .020", concerned about possible future dents as much as anything. Again I want to know where the thinnest area is and decide then. At 20+" I would still shoot it with reasonable loads, but that is just me. And I have put a lot of worry into the math, the measurements and what "reasonable" loads are, which is as much a personal thing as anything. I shoot a 20 bore Pape that has a barrel with .017" wall, but that is 27" on a set of 30" barrels. Still I keep pressures down low and am careful about any actions which could dent it. It is a lovely hammer gun and a nasty dent might be the end of shooting her.

Joined: Apr 2022
Posts: 77
Likes: 62
Sidelock
Offline
Sidelock

Joined: Apr 2022
Posts: 77
Likes: 62
Have you weighed the barrels? My Webley 600 with 30" barrels weighs 1440 grammes (sorry about the Metric units...) whilst my Jeffery hammer gun, Farmer's Model, and shown as a 13 bore on the Proof marks weighs 1540, also 30 inches long.

HB

Joined: Nov 2015
Posts: 1,130
Likes: 19
Sidelock
**
OP Offline
Sidelock
**

Joined: Nov 2015
Posts: 1,130
Likes: 19
I don’t know the barrel weight, but the guns total weight with 30” barrels is 6.4.

Joined: Jun 2008
Posts: 2,761
Likes: 111
Sidelock
***
Offline
Sidelock
***

Joined: Jun 2008
Posts: 2,761
Likes: 111
If it's In Proof and the right cartridges are being used I would give it a second thought. As to overbored barrels I once had an English single barrel gun with Damascus barrels that started life as 16 bore and Proofed for Black Powder and later re-bored out and re-chambered to 12 bore and passed for nitro. Lagopus.....

Joined: Jan 2002
Posts: 9,882
Likes: 103
Sidelock
*
Offline
Sidelock
*

Joined: Jan 2002
Posts: 9,882
Likes: 103
to be safe, shoot 75 grains or less of 2f black powder and one ounce of lead shot, over fiber cushion wad...

when test firing, spread a bed sheet on the ground, in front of muzzles...if a lot of unburned powder is found on the sheet, reduce charge by five grains, until just a little amount of unburned powder is found on the sheet...that is your optimum load for this gun...

when pin hole leak appears in barrel wall, time to stop shooting and hang gun on wall...

Last edited by ed good; 08/11/22 12:46 PM.

keep it simple and keep it safe...
Joined: Mar 2002
Posts: 7,812
Likes: 575
Sidelock
**
Offline
Sidelock
**

Joined: Mar 2002
Posts: 7,812
Likes: 575
Why would you shoot Black powder in a gun recently proofed for a nitro? That makes no sense at all. The Birmingham Proof house told me a gun I had which was reproofed for Black powder should be fine for 2 1/2” nitro loads. Sane loads would be fine. It seems there was not significantly more pressure in nitro proof in the 1930. Then gun is still well in proof. Guns can’t tell what powder you use only how high the pressure is. So keep the pressures down to 7,000psi, or if really conservative 5,500 psi and shoot the darn gun. There are a lot of sub 7,000 psi loads to pick from so why bother with Black?

Page 1 of 2 1 2

Link Copied to Clipboard

doublegunshop.com home | Welcome | Sponsors & Advertisers | DoubleGun Rack | Doublegun Book Rack

Order or request info | Other Useful Information

Updated every minute of everyday!


Copyright (c) 1993 - 2024 doublegunshop.com. All rights reserved. doublegunshop.com - Bloomfield, NY 14469. USA These materials are provided by doublegunshop.com as a service to its customers and may be used for informational purposes only. doublegunshop.com assumes no responsibility for errors or omissions in these materials. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT-ABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. doublegunshop.com further does not warrant the accuracy or completeness of the information, text, graphics, links or other items contained within these materials. doublegunshop.com shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of these materials. doublegunshop.com may make changes to these materials, or to the products described therein, at any time without notice. doublegunshop.com makes no commitment to update the information contained herein. This is a public un-moderated forum participate at your own risk.

Note: The posting of Copyrighted material on this forum is prohibited without prior written consent of the Copyright holder. For specifics on Copyright Law and restrictions refer to: http://www.copyright.gov/laws/ - doublegunshop.com will not monitor nor will they be held liable for copyright violations presented on the BBS which is an open and un-moderated public forum.

Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.0.33-0+deb9u11+hw1 Page Time: 0.498s Queries: 36 (0.050s) Memory: 0.8446 MB (Peak: 1.8991 MB) Data Comp: Off Server Time: 2024-11-10 01:00:08 UTC
Valid HTML 5 and Valid CSS