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Aug 5th, 2016
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mc, Parabola
Total Likes: 3
Original Post (Thread Starter)
by Jose Fernandez
Jose Fernandez
Hello,
I will make a pair of inserts to use a very pitted 12 ga barrels from an old Darne shotgun.
The idea is to make a 12 to 20 ga tube about 1 foot long, to avoid the heavy pitted area in the barrels.
My question is, the steel that it is locally available are:

-1518 carbon steel or
-T-304 stainless steel.

Could you tell me what material is better for the purpose?

I will work the material in a lathe.

Thank you for your replies.

Best,

Jose
Liked Replies
by Ted Schefelbein
Ted Schefelbein
What do the barrel walls measure? Every Darne at my house, 3 at the moment, is over .050 wall. I’ve measured guns that had .020-.030 thicker walls, too. If the gun saw double or triple proof, when it was a new gun, you might not need to worry too much, if you feed it light hunting loads.

Let’s see a photo of the flats and the tubes where they enter the flats.

Best,
Ted
1 member likes this
by skeettx
skeettx
I cut a slot in the inserts,
welded up some 12 gauge extractors,
and refitted them to 16 gauge.
All now work as a normal 16 gauge
1 member likes this
by AGS
AGS
If you use any kind of inserts, trybefore buying. I have a set of Brily's (the fits all version). an older set of another brand, and chamber adapters of several brands. Only the old ones work in 2-1/2" chambers and they were custom ordered for the gun.

I think you should really consider honing/reaming the barrels. I am refurbishing an old R-11 16 ga right now. The bores were horrible looking. I lengthened the chambers so I could us inserts if I wanted. I used a long forcing cone reamer to helps remove some of the worst pitting. I then used an expanding reamer to remove about 0.015 from the bores (diameter). After honing and polishing the wall thicknesses were still thicker than the bulk of the doubles I shoot.

This is a common case of worrying about originality, when in actuality the serious pitting will detract more from value than a barrel opened up, clean and still with good wall thickness.

Do a lot of measurement before hand. It is hard to hone heavy pits out smoothy and reaming to size then honing is usually better. I have found that I was always surprised, however, how little removal can be needed to remove some horrible looking pits.
1 member likes this

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