Jug Choke

[Hoyt]

Does anybody know much about jug choking. How one might go about doing it himself. I read on another forum where some guy did his own and really tightened up his pattern.
I'm getting a fairly good pattern out of my new .62 smooth bore..but would like to increase the effective range. Too close to spring gobbler season now but afterwords maybe.
I've called all the local gun-shop's gunsmiths and they never heard of jug choking..it's the same thing as back boring isn't it?

 

[Stumpkiller]

It is called "recess" choke. It can be done by hand with emery cloth and a bunch of patience.

I think it's also known as "Tula" choking (the Russian arsenal). Kreighoff uses it in their skeet barrel, so it must be quite effective.

 

[Hoyt]

This is what Spencer says about it in the Notebook..

"A special type of choke, the 'jug' choke, can be done to cylinder bore barrels, and this is a very efficient choke. It consists of a precisely shaped widening of a short section of the bore just behind the muzzle, achieved by removing metal. Since the smallest diameter of the cylinder bore is not decreased, but only increased in that one area, no difficulty is encountered in ramming wads down, yet the gun will shoot with the best of the modern chokes. This is a custom gunsmithing job, and has never been offered on any commercial replica."

I'm going to see how it does this gobbler season and may try one. Caywood does a .20ga. jug choke now for $90.00 but don't know if that's just his barrels or what. There's another guy who works with Muzzle Blasts that does them..don't know what he charges. I just hate to send my barrel off.

 

[rayb]

V M Starr wrote a small book on how to do it. My copy is in a box in the garage, i wish i knew which box. Dixie may still have it available, that's where i got mine origially. V M Starr was the author.

Basically take a brake cylinder hone and cut a litle, shoot a little. May be hard to find a brake cylinder hone any more in this throw away society.

Have just acquired a jug choked shotgun, will try it out this weekend. Hoping for the best...

rayb

 

[Eric Krewson]

One of my friends did his own jug choke on a 12ga flinter. It came out really well. He killed a turkey last year with the gun and put 6 pellets in the head and neck at about 30 yds. He described the procedure to me but the particulars have slipped my mind. Seems like he took about 10 thousands off the inside of his barrel with a brake hone and checked his progress by feel only.

 

[Hoyt]

That's my problem everything seems to slip my mind..I read a post with the details of how to do it..but forgot the details.

 

[varsity07840]

I had my flint Mortimer jug choked by Gene Reem. First rate work. 309-526-8466. I think he charged me $75.00, a few years ago.

 

[Hoyt]

Thanks for the name and number Duane..did the jug choke tighten up your pattern much and did it give a better pattern at further distance. I'm looking for a good pattern out about 35yds. with .62/20ga.

 

[roundball]

Thanks for the name and number Duane..did the jug choke tighten up your pattern much and did it give a better pattern at further distance. I'm looking for a good pattern out about 35yds. with .62/20ga.

FYI...I talked with a man out in the mid-west who does these, about doing my .62cal smoothbore.

He explained that the jug choke involves a 6" section of bore, starting just inside the muzzle.

It consists of a 3" section honed out as a chamber with a 1.5" tapered forcing cone on each side of the 3" chamber.

The amount of honing is determined by the amount of choke that you want.

The shot charge travels up the bore, begins to expand as it hits the first 1.5" tapered section...becomes fully expanded in the 3" long expansion chamber...then begins being forced back down to cylinder bore size by the final 1.5" tapered section.

This expansion / reduction action on the shot column produces a result that has the effect of it being choked.

But then I experimented with paper shot cups and get eight #6 pellets in a coke can at 40 yards so I didn't pursue the jug choke any further

 

[Hoyt]

But then I experimented with paper shot cups and get eight #6 pellets in a coke can at 40 yards so I didn't pursue the jug choke any further

That's the reason I'm going to wait till after the gobbler season..I read your post and wanted give the barrel a true test to see if it was going to be necessary.

 

[varsity07840]

Thanks for the name and number Duane..did the jug choke tighten up your pattern much and did it give a better pattern at further distance. I'm looking for a good pattern out about 35yds. with .62/20ga.

A much tighter pattern. It pulverizes a shoot 'n see turkey
head target at 30 yards. I actually have to let pheasants get out there a bit.

Duane