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Re: How thin is to thin? PALUNC #311293 01/28/13 07:36 PM
Joined: Feb 2002 Posts: 2,859 Currently Arizona Rockdoc Sidelock
Rockdoc Sidelock Joined: Feb 2002 Posts: 2,859 Currently Arizona	If one's needed, I have a micrometer with a round anvil for measuring tubing wall thickness. Steve Approach life like you do a yellow light - RUN IT! (Gail T.)

Re: How thin is to thin? AmarilloMike #311295 01/28/13 07:43 PM
Joined: Apr 2011 Posts: 714 Likes: 9 Hoof Sidelock
Hoof Sidelock Joined: Apr 2011 Posts: 714 Likes: 9	Originally Posted By: AmarilloMike Originally Posted By: Hoof So how thin were the walls at the burst? 5/1000th or 50/1000ths? If we are talking the last third of the muzzle end of the barrel 21/1000th is plenty for me. If we are talking a 1/2" from the muzzle end of the chamber it is not. Does the story that goes with that picture give any theories of the failure? Sorry, I wasn't trying to draw inferences between the pictured incident and the OP's question. Just wanted to show the seriousness of a failure. CHAZ Last edited by Hoof; 01/28/13 07:44 PM.

Re: How thin is to thin? Silvers #311301 01/28/13 08:16 PM
Joined: Jul 2005 Posts: 7,065 Amarillo, Texas AmarilloMike Sidelock
AmarilloMike Sidelock Joined: Jul 2005 Posts: 7,065 Amarillo, Texas	Originally Posted By: Silvers Don't fool yourself about thin walls being OK at the muzzle end of choked guns. Here's a set of Krupp steel barrels on a graded Fox that were struck to remove surface corrosion before rebluing. They seemed fine until about 100 shots were fired through each tube..... 1 ounce lower pressure lead loads on a sporting course. One pic is worth a 1000 words; that's a bulge, gents. Choke wall is .018" thick where shown by the arrow. Both tubes measure about the same in that area and both have bulges. Silvers A few years ago I was talking to a friend who had recently bought a Birmy Boxlock. The first time he shot a box a shells through it a bulge appeared just ahead of the choke. He sent it off to his favored gunsmith and had the dent taken out. Next time he shot it the same bulge reappeared. I am glad to be here.

Re: How thin is to thin? PALUNC #311371 01/29/13 10:18 AM
Joined: Feb 2004 Posts: 13,880 Likes: 16 Torrance, CA Chuck H Sidelock
Chuck H Sidelock Joined: Feb 2004 Posts: 13,880 Likes: 16 Torrance, CA	I can't recall exactly what the product was, but I recall a process where an irregular profile was machined on the o.d. of a tube and the i.d. was a straight hole. The part was then swaged into a die that made the o.d. straight. The i.d. that resulted had the irregular shape as though it was machined. I think it was a rocket motor case or something like that. My thought was that this bulge in Frank's gun is the imprint of the inside profile where the payload swaged the barrel out.

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