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Author Topic: Drilling & Tapping Shotgun Barrel  (Read 1607 times)

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Offline casper_zip

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Drilling & Tapping Shotgun Barrel
« on: October 11, 2011, 06:09:36 PM »
Hey there:
 
Have a plain ole vanilla 20 ga. smoothbore, and would like to scope it. I already see/know that a smoothie can shoot the slugs it likes very, very good. Now, that being said; I could/can do lots better with a scope on the barrel. I see that the standard base is 3 holes, and I don't see any problem drilling and tapping.
 
Just would like some of you to chime in your thoughts and/or experiences on this type of project. I have drilled and tapped S&W pistols, I have never lost a scope on them. One scope got destroyed, but the mounts, etc. were not at fault. The big Smith recoil got the scope.
 
Best,
 
casper_zip
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Offline gcrank1

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Re: Drilling & Tapping Shotgun Barrel
« Reply #1 on: October 12, 2011, 05:38:10 AM »
There was a good bit of discussion on this very thing in the not too distant past; I just cant remember under what topic to get you a reference (but it is in the past pages, for sure). Hopefully somebody will have it and chime in.
IIRC, the 20 has enough meat around the chamber to do it with no worries (the 12 gets 'iffy' and some g'smiths wont do it) On a kicker I would use #8 screws rather tha #6s, and the 3 hole base should be fine, but with it all jigged up and all maybe its not much extra trouble for you to do 4 holes.
FWIW, I think a small, light, low power scope or a reddot should be dandy.
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Offline Rodland

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Re: Drilling & Tapping Shotgun Barrel
« Reply #2 on: October 12, 2011, 04:30:05 PM »
I just finished drilling & tapping my 20 ga. I had to cut the screws I had as they were to long. I used a piece of scrap metal, drilled and tapped it for the screw and ground the screw to the proper length. With it screwed into this metal plate it was easy to hold and grind as well as when it was backed out the threads were good enough to start easily into the barrel.
 
I used #6 screws ( what I had on hand) but if I was to do it again I would go with #8.
 
Not sure but I think I went .140 deep with the holes and used a bottoming tap.
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Offline Jal5

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Re: Drilling & Tapping Shotgun Barrel
« Reply #3 on: October 13, 2011, 08:09:14 AM »
My gunsmith did the 20 ga. pardner barrel with no problem. Now wears a Bushnell Banner scope, 1x4 very good for Ohio deer season.
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Offline spikehorn

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Re: Drilling & Tapping Shotgun Barrel
« Reply #4 on: October 13, 2011, 05:39:49 PM »
I have a tracker II, a Tracker I, and a pardner 22" 20ga all have been drilled and tapped no problems
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Offline BUGEYE

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Re: Drilling & Tapping Shotgun Barrel
« Reply #5 on: October 13, 2011, 05:44:21 PM »
I forgot to set the depth-stop on my drill press and ruined the barrel.
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Offline TNBilly

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Re: Drilling & Tapping Shotgun Barrel
« Reply #6 on: October 13, 2011, 06:01:17 PM »
Quote from: BUGEYE on October 13, 2011, 05:44:21 PM
I forgot to set the depth-stop on my drill press and ruined the barrel.

the hole can always be welded up and redone.  Barrel certainly isn't ruined. 
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Offline gcrank1

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Re: Drilling & Tapping Shotgun Barrel
« Reply #7 on: October 14, 2011, 05:52:10 AM »
Because you drilled down into the chamber?

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Offline BUGEYE

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Re: Drilling & Tapping Shotgun Barrel
« Reply #8 on: October 14, 2011, 07:40:18 AM »
Quote from: gcrank1 on October 14, 2011, 05:52:10 AM
Because you drilled down into the chamber?
yep.  I cut that ejector thingy off and tossed the barrel.  then nef fitted a new barrel and I sold it.
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Offline spooked

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Re: Drilling & Tapping Shotgun Barrel
« Reply #9 on: October 22, 2011, 07:10:14 AM »
Did this to one when I was legally blind! :( "Paco" Kelly 8) was kind and patient enough to write and tell me it could be salvaged bythreading and putting short socket set screws in it flush with the chamber and applying some jb metal-weld inside the chamber and smoothing up. Even took the time to x-plain to dis dumbass that the reason for the short screws were so there would still be room for  scope mount screws. :)
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Offline gcrank1

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Re: Drilling & Tapping Shotgun Barrel
« Reply #10 on: October 22, 2011, 09:47:48 AM »
Yep......fixable.......but done & gone.
There's many ways to skin a cat.
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"Halt while I adjust my accoutrements!"
      ><   ->
We are only temporary caretakers of the past heading toward an uncertain future
22Mag UV / 22LR  Sportster
357Mag Schuetzen Special
45-70  SS Ultra Hunter with UV cin.lam. wood
12ga. 'Ol' Ugly OverKill', Buck barrel c/w  SpeedStock  and swap 28" x Full bird barrel, 1974
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