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Old April 9, 2011, 01:23 PM   #1
Join Date: February 15, 2007
Posts: 75
Kirbythegunsmith's Comprehensive List: chamber/forcing cone/choke/bore

I have assembled this gathering (Thanks to Dave McC) of over 30 threads that have relevant input from me concerning details that may improve understanding concerning shotgun barrel performance.
All are placed in order from the oldest first, and each has a comment of subject.

This listing was drawn up by me to bring all of my relevant material into one gigantic free-for-all that just might either get a reader to be convinced or burst a vessel fighting off the logic.

Some slightly off-topic (but entertaining and educational) stuff mixed in places.

You should be entertained for quite a while with this peek into the past posts.

ps Remember to see the website (see at bottom) for archive articles there.

This is about short shells in long chambers, with some details about shot deformity etc to assist understanding.


Note that after my posting about choke errors being disputed, BG posted a series of links to my various postings for reader enlightenment.

You'll appreciate the pictures of the forcing cone and choke problem here:

And here when I mentioned the choke angle issue, Jugchoke came to the conclusion I was on target about chokes being off-target.

And here SuperXOne agreed with my take on the choke problem, with only a slight hint of sarcasm-imagine that!


A Real Monster knock-down drag-out...

(This has some interesting graphics I put together to explain by pictorial method)
No posting would be complete without a knockabout r.e. backboring (47 posts):

Can't neglect the information about the Polychoke cracking and choke damage- could be mitigated by a longer forcing cone:

And short shells in long chambers, redux plus:

And RASTOFF even said somebody might need a pro like me to examine a bad choke tube hole here:

53 posts on 3 pages must be serious!


Comedy relief break: see the cracked choke pictures.

Then see the barrel bulge ring fun-for-all:

Some took exception to my treatise on chamber length and safety:

That's why I wrote this addendum:

More short shell in 3.5" chamber factorization:

More Komedy mixed with sparx.
Here is where I had to fight the snipers in the bushes- and the treatment was less than kind- but the "opposing force" was around for only those 2 posts jibing me- gone and definitely not missed.

Forcing cone discussions can go in just about any direction.

Not a lot from my input, but damascus barrels blowing can be an interesting read.

The comprehensive "crooked choke tube discussion, recognition, and lack of common sense to recognize a real issue" (along with a bit of gratifying defense of my posted input). Even EVButler got in an "attaboy".

Who wants to see some barrel dent repair pictures?

Not a bunch here, but if we are striving for completeness, ports and forcing cone comments R.E. recoil do fit:

Bulge commentary 1:

And 2:

Latest iteration (3.5" chambers, 2-3/4" shells) and some admissions that excess chamber length could deform lead pellets when shorter shells were used in longer chambers- who knows, maybe it is possible to change a securely-held opinion. Certain I am that there were differences of opinion, if not intelligence.

More cracked chokes- not cracked jokes.
Jugchoke agrees with me again!

Still not sure why choke tubes loosen even when heavily tightened?

Minor input concerning barrel length and pattern influence.

Much more input of barrel length influence in this posting.

Bent barrel correction details, patterns.

Choke and bore defects in a two- part posting.
Includes comments in this appearance.

More details concerning a choke installation gone awry.
[email protected]
New gunsmithing website:
Articles containing valuable information are on every page.
kirbythegunsmith is offline  
Old April 9, 2011, 07:25 PM   #2
Dave McC
Staff In Memoriam
Join Date: October 13, 1999
Location: Columbia, Md, USA
Posts: 8,812
Thanks, Kirby. Let's see if this answers some questions for the folks.....
Dave McC is offline  

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