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Backboring and lengthing forcing cone


Ringer

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Backboring is often done to allow you to tighten the choke, or to clean up bad pits.  I'd not be inclined to do a backbore unless you needed either of those.  Barrel has to be checked with barrel calipers to see if there is sufficient metal for that to be safe, too.   Backboring itself does not reduce recoil noticeably.

 

But I would lengthen the factory forcing cone in a minute!   Even have the reamers and the hones and have done that myself.   It does make a bit of reduction to the recoil, and decreases the fouling you get at the forcing cones.  I've seen numbers of about 10% felt recoil reduction.   There's only a few old guns that I would pre-check before starting, especially those that might need the chamber lengthened  out to 2 3/4" plus the forcing cone tapered.   Then you should be concerned about final chamber thickness at the forcing cone.

 

If barrel is chrome plated, I wouldn't touch it with machining.

 

Good luck, GJ

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I have had Briley backbore numerous SKBs (and, I suspect Briley is probably who did Goatnecks).  I like it but not sure worth it for CAS.  (NOTE:  you will loose most, or all,  of the chrome liner of your barrel.)

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A lot depends on the SPECIFIC gun.  If you have an older shotgun with 2 1/2 inch chambers, re-chamber and longer forcing cones are a really good idea, IF YOU HAVE ENOUGH METAL.  Backboring is only applicable to some guns with bore pitting.  If the bores are chrome lined, backboring will remove the lining and potentially turn the barrels to junk.  Longer forcing cones will reduce felt recoil.  Backboring will not.

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I had the forcing cones lengthened and polished on my Stoeger. It did reduce recoil a little (I think!), but sure made cleaning a lot easier. That 3/4" unpolished section from the factory was a pain to get the plastic out of. The cost was not really worth the result though on a inexpensive SG. Smith estimated $150 and when he got it back from his "specialist" it was $300! Only $75 less than the gun cost brand new when I bought it in 2005. JMHO

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5 minutes ago, Eyesa Horg said:

got it back from his "specialist" it was $300!

 

It was quite worthwhile to the feller who got paid to do that.  :(

 

The tools to do a nice job of forcing cone reaming don't cost that much ($300).  And the labor is maybe 2 hours.   Briley's of Houston only charges $95 a barrel to do that job, and they are about the best in the world!

http://www.brileygunsmithing.com/c-879-full-list-of-shotgun-gunsmithing-pricing.aspx

 

Yes, that job was "way above the normal" cost level.

 

Good luck, GJ

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It won't happen again, that's for sure. For God knows what reason, sometimes I seem to need to learn by experience! Maybe it's the "ski" on the end of my name!:P

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