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 Post subject: Cracked choke tube
PostPosted: Wed May 14, 2008 9:15 pm 
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Joined: Mon Jan 01, 2007 9:52 am
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Location: WestBend, NC
Hey Guys,
I had have 391 with optima + chokes. Removed mod. tube to clean after a coupla boxes of shells . Found it cracked from end to end. Came loose from barrel with normal resistance, but had a linear crack from end to end.
Is this a common ocurrence?
The Optima + tube is fairly thick.
Looks like some after markets are needed , I am going to Argentina in 2 weeks.
Dan




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 Post subject: re: Cracked choke tube
PostPosted: Wed May 14, 2008 10:33 pm 
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Location: Gimping in Grayson Co Tx
Quote:
Is this a common ocurrence?


NOPE! :o

You da first for me :!:

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 Post subject: re: Cracked choke tube
PostPosted: Fri May 16, 2008 1:11 am 
Gunsmith
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Location: St. Louis area
How does this view look?

Image

This is the full-length view.

Image

Notice that the crack is packed full of wad plastic and fouling.

I have more to show along the line of damaged chokes: mismatched, mis-aligned, mis-cut, offset, burred, ding edge, abused, pounded, bulged, rusted, peeled, split, de-chunked, defunct, disaster, almost blast-er, ............

Maybe you'll look at my previous postings to see what's there.

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Article 3 pictures improper or dangerous choke installations, article 1 has explanatory illustrations, and article 2 has info. about bore/forcing cone improvements/limitations.


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 Post subject: Re: re: Cracked choke tube
PostPosted: Fri May 16, 2008 10:24 am 
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RWH24 wrote:
Quote:
Is this a common ocurrence?


NOPE! :o

You da first for me :!:


When the question was asked, I replied about Beretta Optima +
tubes cracking.
Yes, I have heard of other guns having the choke tubes split.

Again, I was answering about Beretta Opt+ tubes.

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 Post subject: re: Cracked choke tube
PostPosted: Fri May 16, 2008 1:38 pm 
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Location: St. Louis area
I wasn't trying to imply that the "you" in my line about reading my previous posts was a specific "you" as opposed to a generic meaning for all curious readers. Maybe I should have said "curious readers".

Sorry if there was any misunderstanding and no slight was intended. I do apologize for any mis-application.

I typically formulate answers with the intention to inform beyond the point in question if I believe that readers would find the information useful or interesting.
That is why I thought the readers would like to see a picture vs. the 1000 words.
Reminds me of the fact that very recently I noticed (for the first time) a Polychoke with cracks starting in the collet finger slot edges. I posted that, as well, and wrote a complete article that included specifics about that situation along with other stuff.

Kirby

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Articles on every page.
Article 3 pictures improper or dangerous choke installations, article 1 has explanatory illustrations, and article 2 has info. about bore/forcing cone improvements/limitations.


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 Post subject: re: Cracked choke tube
PostPosted: Fri May 16, 2008 1:59 pm 
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I've not seen a Beretta crack tubes like that before.

It's rather common with some brands of guns. Not going to name names (gobble gobble) lest I be labeled a basher (gobble gobble).


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 Post subject: re: Cracked choke tube
PostPosted: Fri May 16, 2008 6:02 pm 
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Kirby,

We are good, No sweat :wink:

Check your PM's

Randy

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 Post subject: re: Cracked choke tube
PostPosted: Mon May 19, 2008 3:49 pm 
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Joined: Sun Nov 06, 2005 5:54 pm
Posts: 867
Location: Ontario, Canada
I've seen one (only) ... also a modified ... an Optima extended in a 682 GoldE.


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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 5:19 am 
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Joined: Thu Aug 31, 2006 10:06 am
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Location: UK, England, Britain
thats a serious issue.
hope you get it sorted, thats not a crack, thats a bloody great hole!


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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 7:06 am 
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Location: WI
I've seen 2..... Both were flush Optima+ full chokes in a 391. Same guy cracked 2 of them. I think overtightening the choke and no anti-sieze in the threads caused the problems.

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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 7:08 am 
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Location: Tom Green, Runnels, Coke and other counties out here
dechunked? Hmmm, one of those new-fangled technical terms? :lol:

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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 7:44 am 
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Joined: Mon Jan 01, 2007 9:52 am
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Location: WestBend, NC
My tube has a linear crack, no chuncks missing.
I had cleaned and installed choke with anti seize on threads.Shot 25 round wobble trap. Shot rest of day with a 20 ga.
At home cleaned shotgun .Choke came out with normal reistance. There was some blackening to barrel wall but no damage. I guesss I thought these chokes were supposed to be "tuffer" to handle steel hunting loads. My email to beretta has not been answered. I bought Power gold and shot it Sat. It did just fine for 2 rounds clays.
I tried photo, but cant get a decent one.
Picture in your mind a as new looking choke with a thin almost straight crack from end to end.[img][img]http://www.hunt101.com/data/500/medium/cracked.png[/img][/img]


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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 8:25 am 
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:idea: JMO....A bad choke tube passed Q/C inspection and you ended up with it. Period

Have you shot any of the other choke tubes that came with the gun?

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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 8:49 am 
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Location: WestBend, NC
Thats my thoughts RWH24. I shot IM about 2000 times , Full maybe 200 times all shots with lead shot.. I have checked other choke tubes but no indications of cracks. This cracked mod choke had been fired about 2500 times.
I switched to Beretta for my Argentina Pigeon gun due to claims of reliability I never cracked a choke tube in Rems. They just got very dirty. Does Crio deep freezing help internal stresses on a choke tube?


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 Post subject: re: Cracked choke tube
PostPosted: Tue May 20, 2008 1:10 pm 
DFW Dominant Predator
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Location: Gimping in Grayson Co Tx
Quote:
Does Crio deep freezing help internal stresses on a choke tube?

No idea, it has been used on barrels and other metal items...

Could be an over used marketing HYPE for no more than it actually produces results.

1 tube out of ?? how many thousands made and distributed, it is bound to happen. I never had a problem with my Optima + tubes before I traded it off for the O/U...I hunted Dove, Duck and Clay birds....It was my loaner gun too for awhile. It was used, not abused and no tube failures.

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 Post subject: re: Cracked choke tube
PostPosted: Wed May 21, 2008 1:04 am 
Gunsmith
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Location: St. Louis area
I believe this fits the description of "de-chunked" or "peeled", plus "defunct" or "disaster-almost blaster".

Image


Anybody else have any better terms?

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Gunsmithing website:
http://theshotgunshop.net
Articles on every page.
Article 3 pictures improper or dangerous choke installations, article 1 has explanatory illustrations, and article 2 has info. about bore/forcing cone improvements/limitations.


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 Post subject: re: Cracked choke tube
PostPosted: Wed May 21, 2008 9:20 am 
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Quote:
Anybody else have any better terms?

:idea:
FUBAR
:lol: :lol: :lol:

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 Post subject: re: Cracked choke tube
PostPosted: Fri May 23, 2008 11:24 am 
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Joined: Wed Oct 26, 2005 12:45 pm
Posts: 66
I'm new to this forum, and was just lurking (I have a WallyWorld 390).

But, looking at the crack, it propagated from the castelated notch corner (for the choke tube wrench). It is a stress crack.

If there was a sharp edge in the corner of the notch and the tube was HT it could have started then.

Sharp edges, corners, etc. are "stress risers" and subject to fatigue (cyclic) failure. So, over a course of pressure cycling, from low pressure to the gas pressure just before the load exits the muzzle it could fatigue and crack. This is ignoring any hoop stresses from the payload pushing against the barrel wall.

My best guess is a manufactured defect, either in machining or resulting from HT.

Good luck,

3drahthaars


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 Post subject: re: Cracked choke tube
PostPosted: Sat May 24, 2008 8:21 am 
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Joined: Tue Jun 13, 2006 9:52 am
Posts: 57
Last week hunting doves and perdiz in Uruguay I had a similar problem with my Urika ( Optima Plus)
Using a Mod choke the entire hunting when I come back home I noticed a small piece of choke disappeared and a longitudinal crack as you noticed from the bottom to middle of choke.
No barrel damage but was terrible to remove the choke.
My impression is this choke is harder than usual ( factory problem) and It was necessary to put Loctite on a iron piece and glue to remove it.
Trying to remove using choke wrench the choke was breaking as glass.
If anybody interested I could post photos.


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 Post subject: re: Cracked choke tube
PostPosted: Sat May 24, 2008 8:34 am 
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Location: WestBend, NC
Perdiz hunter,
Sounds like your choke may have come loose then caught the ejecta coming out barrel. I have seen a few do that after several rounds at doves. They are a bear to get out. One fellow from a different group knew his 20 ga was loose but kept shooting since he could not remove it in the field. I was amazed he had no damage to freads. They were full of plastic.
Gotta ask......hows the dove/pigeon in Uruguay?
I am headed to Villa Dolores June 4. We will try Perdiz for a few hours I afternoon. I was born hunting Bobwhite and these
perdiz are similar. Do you use a dog or walk the birds up?




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