Choke ream on chrome lined shotgun barrels

LuckyStrike

LuckyStrike

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I am soon to be the happy owner of a 12ga AyA #3 , Magnum with "elecro chromed barrels"

Needing a gunsmith to make this F/Mod into IC/IC

Any suggestions to find a gunsmith in BC or the West who could do it?

Thanks for your help

LuckyStrike:shotgun:
 
LuckyStrike said:
I am soon to be the happy owner of a 12ga AyA #3 , Magnum with "elecro chromed barrels"

Needing a gunsmith to make this F/Mod into IC/IC

Any suggestions to find a gunsmith in BC or the West who could do it?

Thanks for your help

LuckyStrike:shotgun:
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You will not find one in the whole world.... The hardness of the chrome is to much even for the carbide reamer. Ceramic one would do but I never even heard of one. IMHO you are stuck with what you have or the barrel can be cut for the cylinder/cylinder choke....:)
 
gunrunner8 said:
You will not find one in the whole world.... The hardness of the chrome is to much even for the carbide reamer. Ceramic one would do but I never even heard of one. IMHO you are stuck with what you have or the barrel can be cut for the cylinder/cylinder choke....:)
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What he said ^^^. I don't know what he does but I make reamers for a living and he is dead right.
 
carbide?

mg4201 said:
What he said ^^^. I don't know what he does but I make reamers for a living and he is dead right.
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Interestingly on several US sites dedicated to shotguns, there are many threads about this and people telling of their success in changing chokes through the chrome lining. A tool harder than the chrome (such as carbide) needs to be used.

Maybe they are all hack jobs, ?? but most seem happy with the results.

I'll keep digging....... gotta be a way!

Lucky

http://www.shotgunworld.com/bbs/viewtopic.php?f=12&t=252707
 
I don't alter chokes in chrome lined barrels because I don't have carbide reamers..

But a carbide reamer will cut chrome lined barrels.

I had a specially ground piloted carbide reamer made when I used to install thin wall choke tubes. It removed the chrome lining with no problem.

You just need to find a fellow set up to work on chrome lined barrels.
 
The biggest problem with honing is the time and the unevenness/distortion/accuracy as you polish through the chrome...
 
guntech said:
..

But a carbide reamer will cut chrome lined barrels.

I had a specially ground piloted carbide reamer made when I used to install thin wall choke tubes. It removed the chrome lining with no problem.

QUOTE]

When I worked for CD Hydraulic I sure would like to see you cut thru hydraulic cylinder chrome shaft with carbide insert. Either your "chrome" wasn't chrome at all or you don't know what you talking about....
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diamond hone

I just received a helpful email from a well known British gunsmith.

He was surprised that I was having problems finding someone here to do the work....

He said..

What is needed is a diamond hone to break through the chrome , after the first few thousanths have been bored out you can revert to normal stones . It is the norm to have to bore them right out with stones and this will take longer than cutting with reamers and as a result will cost a little more.
I dont know wear you are in Canada but have you tried Nick Mackerson

I will try and locate this fellow, Nick (in Ontario), unless someone in BC can be found over the next few weeks.
 
art.h said:
Honing will also do it as well..
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THIS was what i was going to say. The chrome isn't goingto be more than a couple thou, and a brake cylinder hone will go through that in a couple minutes. After that, a hss reamer should work just fine.
 
problem i found with honing the chrome out was that a lot of the times it doesent take the chrome off evenly or the barrel underneath is not even so it leaves chrome on one spot and not on others.
 
Take the gun to Gone Fishin in Nanaimo (or one of their other stores). They have fellow who has carbide reamers and has modified chokes in many chrome lined barrels (12 gauge only at present).
 
gunrunner8 said:
guntech said:
..

But a carbide reamer will cut chrome lined barrels.

I had a specially ground piloted carbide reamer made when I used to install thin wall choke tubes. It removed the chrome lining with no problem.

QUOTE]

When I worked for CD Hydraulic I sure would like to see you cut thru hydraulic cylinder chrome shaft with carbide insert. Either your "chrome" wasn't chrome at all or you don't know what you talking about....
Click to expand...

With "chrome lined" shotgun barrels, a normal choke reamer does not do anything, except maybe get damaged by forcing it into the 'chrome lined' barrel... it was that way 45 years ago when I started gunsmithing and it seems to be that way today as well. 45 years ago carbide tooling was used to alter "chrome lined" shotgun barrels. It is down that way today as well.

Possibly the gun manufacturers don't know what they are talking about when they chrome line a barrel and tell us it is chrome lined. They have only been chrome lining barrels as long as I can remember... Or just maybe there is a difference between the hardness of a hydraulic shaft and the chrome lining of a shotgun barrel and you don't know what you are talking about.. Carbide reamers will fairly easily remove the 'chrome lining' in a shot gun barrel. Many thousands of barrels have been done that way throughout the world...
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What exactly is "electro chroming" anyway ? Is it electro-plating ? Is it hard chroming ? Is it flash chroming ?

If it's flash chroming, a carbide reamer certainly will cut it, I'd even be tempted to try with a hss reamer.

It it's hard chroming, with a soft base metal, then a carbide reamer will cut, but will damage the part of the reamer that has to cut the chrome.

If it's electro plated, cut with a hss reamer no problem.

Hydraulic piston rods are almost always made from 'induction hardened chrome plated' (IHCP) steel, usually 1045. The only exceptions that I know of are in crane boom cylinders, or anywhere personell are being hoisted where they use "chrome plated only" (CPO). CPO will buckle, IHCP will break. Also, princess auto cylinders generally have cpo for piston rods.

The hard chrome layer on IHCP and CPO is anywhere between 65 and 70 Rockwell C, and anywhere between .0005 and .005 thick. If you can cut underneath this, then you are fine. The induction hardened material is a different story. Either you anneal it, or you use ceramic tooling.
 
Nick Makinson, Komoka ON.

I don't know that the flash chrome in a shotgun barrel is the same as the chrome on a hydraulic cyliinder shaft.
 
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