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 Post subject: Model 12 HD- bore vs choke?
PostPosted: Fri Jan 03, 2020 2:50 am 
Tournament Grade

Joined: Wed Jun 22, 2016 11:10 pm
Posts: 172
Quick Question:

On the Winchester Model 12 Heavy Duck, are the barrels thicker, but standard bore of about .730" and then a tapered down choke to the Full Choke of about .690"?

Or, are they like the Ithaca Deerslayer, where the barrel has a full length full choke bore- .690 the entire length?

Just trying to figure out if the HD's thicker barrel is from outside of the standard bore, or partially by having a thinner bore the entire length of the barrel. 1950s version, if that matters.

Thanks for any insight you can offer.



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 Post subject: Re: Model 12 HD- bore vs choke?
PostPosted: Fri Jan 03, 2020 10:25 am 
Crown Grade

Joined: Sun Dec 09, 2007 11:12 am
Posts: 4983
Location: WA/AK
My Model 12 HD is a very late gun. The bore is a very standard .728" with .034" choke. Doesn't pattern 1 5/8 ounce 12-gauge 3-inch Magnum loads anywhere near as tight as my old Super-Fox. Closer to Modified with #6 and just barely 70% with #4s. I suspect being such a late gun it may have been choked for the 1 7/8 ounce 12-gauge 3-inch Magnum loads which first appear in the January 1958 Western Super-X and Xpert Ammunition catalog, but I've never patterned it with them.


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 Post subject: Re: Model 12 HD- bore vs choke?
PostPosted: Fri Jan 03, 2020 10:45 am 
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Joined: Sun Jul 27, 2003 3:37 pm
Posts: 19402
bczrx wrote:
Quick Question:

On the Winchester Model 12 Heavy Duck, are the barrels thicker, but standard bore of about .730" and then a tapered down choke to the Full Choke of about .690"?

Or, are they like the Ithaca Deerslayer, where the barrel has a full length full choke bore- .690 the entire length?

Just trying to figure out if the HD's thicker barrel is from outside of the standard bore, or partially by having a thinner bore the entire length of the barrel. 1950s version, if that matters.

Thanks for any insight you can offer.


Choke refers to a pattern percentage measured in a certain specified way. It corresponds (roughly) with the amount of constriction (difference) between the bore diameter and the diameter at the muzzle end of the gun. If a barrel is 0.690" internal diameter for the entire length of the barrel, then it has ZERO choke because it has zero constriction. This is typically referred to as Cylinder choke, i.e. "No" choke.

The only way to know for sure how a particular load will pattern in your gun barrel is to test pattern it in your gun barrel.

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 Post subject: Re: Model 12 HD- bore vs choke?
PostPosted: Fri Jan 03, 2020 2:51 pm 
Diamond Grade

Joined: Fri Mar 02, 2007 9:29 am
Posts: 1531
Location: Maine
Don't own a Duck now, but measured bores and chokes. You would not be able to differentiate a Duck vs a Trap based on bore and choke diameters. Ie., standard WW ID. And the "full" choke section has the same range of constrictions, length, and profile as any 12 ga "full" stamped M-12.

Dunno about barrel OD. Shoulda measured that before I let mine go.


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