trimming end of barrel to adjust choke?

Thank you boots, that's exactly what I was looking for. Its odd, my Iver Johnson 12 measures out at 0.690 which is almost an extra full. I am on the fence about trimming or honing, whatever I decide on will get a before and after range report and you'll hear from me. Thanks for all the help!
 
Call_to_Arms said:
Thank you boots, that's exactly what I was looking for. Its odd, my Iver Johnson 12 measures out at 0.690 which is almost an extra full. I am on the fence about trimming or honing, whatever I decide on will get a before and after range report and you'll hear from me. Thanks for all the help!
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I have measured many full chokes and they do vary from one gun to another. there doesn't seem to be a noticeable difference in pattern between my 0.695 and my 0.710 using lead shot.
 
It is the difference between the bore and the choked muzzle that determines the amount of choke, not the bore measurement at the muzzle. Either reaming or trimming should work. Go slow, metal can't be put back.
 
Call_to_Arms said:
Hey guys.
I know there are a100 threads on this already but I had a new thought on it. I have a couple of single shot cooeys (just like everyone else) and I'd like to be able to shoot steel through one of them. They all have a full choke in them and I'm told I'd need it modified to somewhere between a modified to a skeet 1 to safely shoot steel out of it. Most local gunsmiths don't even want to look at a 100$ gun and the ones that do say that there isn't enough steel in the barrel to bore it out or thread it for Interchangeable chokes, and if they did either it would be a $150 job, but they still won't. My question is can't the end of the barrel be trimmed back to reduce the choke to something less restrictive? This could be done on a lathe a few thousands a t a time and the muzzle measured with a micrometer to test the progress, couldn't it? I know this is kind of a "backyard" mod but it could help get lots of Canadian made guns back out in the field.... Maybe.

Or maybe this has already been discussed.

Thanks
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I just talked to Joe Dlask on this subject. You need a min barrel diameter of 0.885 to have the barrel threaded for remchokes.
The cost is just under $200 all in to have a Cooey 84 cut down, crowned, threaded for chokes and bead installed.
Yes it is not cheap, but trust me you will enjoy it much more than an ,also bottom of the line, Maverick.
 
willisjake said:
I just talked to Joe Dlask on this subject. You need a min barrel diameter of 0.885 to have the barrel threaded for remchokes.
The cost is just under $200 all in to have a Cooey 84 cut down, crowned, threaded for chokes and bead installed.
Yes it is not cheap, but trust me you will enjoy it much more than an ,also bottom of the line, Maverick.
Click to expand...

One other thing to consider,,,, the bore on many shotguns is not concentric with the outside diameter, so, even if the minimum barrel diameter is over 0.885 it may not be a good idea to thread for screw-in chokes. The problem is that you really don't know until you cut it.
I went with the choke adapter option on a Mossberg 500.
 
Polar_Hunter said:
One other thing to consider,,,, the bore on many shotguns is not concentric with the outside diameter, so, even if the minimum barrel diameter is over 0.885 it may not be a good idea to thread for screw-in chokes. The problem is that you really don't know until you cut it.
I went with the choke adapter option on a Mossberg 500.
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Good point, I cut mine back to 20", at this point the barrel is .915 so there was lots of meat.
Where did you find that choke adapter?
 
Polar_Hunter said:
One other thing to consider,,,, the bore on many shotguns is not concentric with the outside diameter, so, even if the minimum barrel diameter is over 0.885 it may not be a good idea to thread for screw-in chokes. The problem is that you really don't know until you cut it.
I went with the choke adapter option on a Mossberg 500.
Click to expand...

I have used the choke adapters that Brownells sells. Last time I tried, they weren't exporting them. Don't know if this has changed. This is a very effective, easy solution for single barrelled guns. Trim the barrel to the desired length; turn the muzzle to the correct diameter, sweat solder in place. Control the flux, and finish touchup is minimal.
As shown above, these adapters can be custom made, although the reaming/threading tooling would be needed. Ones could be made for choke tubes of choice.
 
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