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  #1  
Old 12-05-2018, 12:44 AM
Rbertalotto Rbertalotto is offline
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Default Shotgun barrel bending jig... change POI

Hardly "Small Caliber"...but I guess #7 shot is Small Caliber......

It's winter. Maybe you might be interested in a little project I just completed.

Do you have a shotgun that simply does not shoot to POA?

I did and I needed to do something about it!

"Shotgun Barrel Bending to Change Point Of Impact"

A full report is now posted on my web site:

http://www.rvbprecision.com

or directly here:

http://rvbprecision.com/shooting/sho...nt-impact.html



Hope you enjoy it!
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  #2  
Old 12-05-2018, 01:30 AM
Bayou City Boy Bayou City Boy is offline
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This is good to see Robert............ I could have used it in my past.

Maybe 12 years ago I mentioned on another forum that I had bought a semi-auto shotgun for trap shooting and that I was going to have the barrel bent to move the point of impact up slightly for a better sight picture on clay pigeons. You should have heard the outcry from numerous people/experts who told me that what I was discussing was impossible and extremely dangerous as shogun pellets might cause a "bent barrel" to explode or, at best, to wear out prematurely. After a couple of days of getting knocked around by a few supposedly knowledgeably dudes, I gave up on trying to explain a fairy common shotgun process to a bunch of non-believing rifle and hand gun shooters.

None the less, I had the barrel bent by a known shotgun gun smith and his work achieved the point of impact change that I was hoping for. I never mentioned the idea again as I didn't want to once again go through the battering I initially took........

Looking back I guess it was just one of life's numerous "bumps" on the internet highway that sometimes occur if you say something that not everyone wants to hear for whatever reason/s........ Or in this case, maybe I should say a "slight bend" on the internet highway.

-BCB
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Last edited by Bayou City Boy; 12-05-2018 at 01:33 AM.
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Old 12-05-2018, 02:05 AM
TinMan TinMan is offline
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Thanks for the article, Roy.

Bending is what every barrel maker - rifle or shotgun - does to straighten barrels. A bend is not a kink.
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Old 12-05-2018, 03:01 AM
Bayou City Boy Bayou City Boy is offline
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Quote:
Originally Posted by TinMan View Post
Thanks for the article, Roy.

Bending is what every barrel maker - rifle or shotgun - does to straighten barrels. A bend is not a kink.
I will agree with about 95% of what you said, especially with rifle barrels as they are hand straightened to eliminate stress from the barrel making process itself. Most of the experts" who offered advice and counsel to me had no clue concerning what I was talking about, but they chirped away none the less. Especially on the safety issue.

In the case of bending a shotgun barrel, it might put a slight deformation on an otherwise straight barrel that can only be "seen" with something like a dial instrument. As you stated, its not a kink, but it is a bend that might make the barrel be less straight in the process. With the shotgun I mentioned, it originally shot to point of aim, but I wanted to be able to aim slightly under the clay pigeon target to be able to see the entire bird better while swinging the gun across the target and to still put shot both above and below the target. The barre bending process gave me that.

-BCB
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I miss mean Tweets, competence, and $1.79 per gallon gasoline.

Yo no creo en santos que orinan.

Women and cats will do as they please. Men and dogs should relax and just get used to the idea.

Going keyboard postal over something that you read on the internet is like seeing a pile of dog crap on the sidewalk and choosing to step in it rather than stepping around it.

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Old 12-05-2018, 03:58 AM
vlcakc vlcakc is offline
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Default Shotgun Barrel Bending

Way back in the 1970's and 1980's I did a lot of ATA registered trapshooting. Many of the top shooters, most being assigned long handicap yardage, wanted guns that shot way above the point of aim and used bent barrels to great success. Fancy jigs with dial indicators, etc. were not typically used. Crude methods, a sharp rap over a 25# bag of shot or even a pickup bumper in the gun club parking lot, were commonly used to do the bends. Hi-grade single barrel trap guns with the barrel bent so severely that the vent rib was buckled down to touch the top of the barrel were often seen on the line. Not pretty, but it worked very well. The bent barrels often tended to straighten back out with heavy use and had to be bent again. Later, many of the hi-grade trapguns were fitted with adjustable ribs to gain the same effect, so barrel bending was not necessary. Vic
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Old 12-07-2018, 08:53 AM
kenbro kenbro is offline
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I remember seeing (Perhaps 50+ years ago) a barrel man from the BSA factory at a Game Show. He was demonstrating how they stretch (Straighten) rifle barrels over a block using just an hammer and his eye.
Ken.
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Old 12-07-2018, 09:12 PM
georgeld georgeld is offline
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Hmm, never knew this before.

Roy: one suggestion I have on your jig. Put a 2nd bolt thru the
bottom of those flats so it won't start moving. Great job and my kinda
steel too. Can't beat tubes.

My first shotgun was a M-37 Ithica. I never could hit the inside of the
barn with it and gave it to Dad. He got pretty decent with it on ducks.
Later years I decided it had a lot to do with LOP of 12 1/2", 2" short for
my needs. I'd always blamed it on the Poly Choke. When Dad died I got
it back. It's looking for a new more appreciative owner.

The only BENT barrel I've ever seen was in elk camp. A guy leaned his
rifle between the bed and cab, then drove off and ran over it. Not only
bending the barrel, it poked thru the cab and bent the bed corner some.
Next thing he wanted to borrow my backup rifle. So much luck there!!
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Old 12-08-2018, 03:39 AM
vlcakc vlcakc is offline
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Default Shotgun Barrel Bending

George, your post reminded me of and incident that happened to me. A long time ago I bought a used 12 ga. M37 Ithaca pump gun with 28" modified plain barrel from a LGS. The salesman was asking $55 and I ended up buying it for $52.50, so that gives you an idea of how long ago it was! I tried it on a round of Skeet and couldn't hit anything. A quick walk to the pattern board confirmed that the barrel at some time had been bent down and point of impact was about a foot low at 40 yds. A friend with a large lathe chucked the barrel up between centers and bent it back up to shoot about 6" high. He also opened up the choke to improved cylinder. It turned out to be a great quail gun then! I shot it for several years and gave it to a hunting buddy that had given me a really good Pointer bird dog.

Point of all this is: If you have a shotgun that doesn't shoot where you look, shoot some patterns at about 40 yds. and find out where it does shoot. Adjustments to the stock or barrel will often correct the problem. Poly Chokes were sometimes installed incorrectly and didn't shoot anywhere near the point of aim. That problem can be solved with a screw in choke tube conversion. Vic

Last edited by vlcakc; 12-08-2018 at 03:46 AM.
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  #9  
Old 12-08-2018, 06:34 AM
georgeld georgeld is offline
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Vic:

Sure don't merit putting that much more money into such
a cheap gun.

kinda like what i did building the NEF .17VR. $100 rifle,
$330 rebuilding it.

Thanks for sharing though
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