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Shotgun barrel wall thickness gauge, from Connecticut Shotgun

Barrel wall thickness gauge

I was up at the James D. Julia Auction Company a few weeks ago looking over the shotguns in their March 11 & 12 sale. A lot of doubles caught my eye – from this great 16 gauge Woodwards O/U to this fantastic, 12 gauge J.P. Sauer Deluxe.

There were lots of nice American shotguns there, too, and I spent a while looking over the 20 gauge Parker and the 12 gauge Lefever shown below. Both guns impressed me with their crisp, original condition. Wanting to know about them, I looked them up in the auction catalog and I was shocked to see how thin the barrel walls were on both side-by-sides.

20 gauge Parker AAHE Double Barrel Side-by-Side Shotgun, owned by Fred Gilbert

20 gauge Parker AAHE Double Barrel Side-by-Side Shotgun, owned by Fred Gilbert

INCREDIBLE, ATTIC FOUND, 20 GA. PARKER BROS. AAHE WITH CASE. SN 161999 “It is absolutely original..Cal. 20 ga. 2-9/16” Chambers…Bbls retain 70 – 80% orig blue….Bore diameter: left-.617, right -.616. Bore restrictions: Mod, Cyl. Weight: 5 lbs. 14 oz…Wall thickness: left -.018, right -.020.

12 gauge Lefever Double Barrel Side-by-Side Shotgun, Special Order

12 gauge Lefever Double Barrel Side-by-Side Shotgun, Special Order

EXCEPTIONAL SPECIAL ORDER EARLY STYLE LEFEVER HEAVY GAME GUN. SN 16438. “Cal. 12 ga, 2-3/4″ Chambers… has 30”. Excellent, as found.  Bbls retain 80 – 90% orig blue. Bore diameter: left-.732, right -.732. Bore restrictions: left – Full, Mod. Weight: 7 lbs. 9 oz. Wall thickness: left -.020, right -.016.”

Afterwards, I went back to both guns and took a long look at the barrels. After a lot of close looking, I couldn’t find any signs of repairs to the barrels. They had to be original. That means the barrels left the factory with those thin spots.

To learn more about bbl wall thickness and it’s importance, check out this article: Thoughts on Barrel Wall Thicknesses from the Parke Gun Collector’s Association. It’s interesting to see what people think today, and what the gunmakers thought back when they were putting these shotguns together.

3 Responses to “Shotgun barrels – how thin did makers really make them?”

  1. Gregg; Thanks for being patient with me on my response to my Alexander McCOMAS 8ga.hammer double…Heads-up.. I will be sending via email some new photos of my shotgun. Let me know if they do not arrive in your mailbox..Guy

  2. Neal says:

    I just saw this wall thickness gauge on the vintagedoubles.com website. It looks quite handy and relatively inexpensive compared to what it buys you in terms of function and protection from a bad purchase or a bad accident.

    I don’t have a gauge, but I sure did enjoy looking into them following your post. Keep up the sharing w/us. Love it.


  3. Gregg says:


    I think that’s a Hosford gauge. I have not used one. I would pick up the gauge that Connecticut Shotgun offers. I have used that one many times, and it’s easy to work and very accurate. The proof houses in London & Birmingham use a very similar model.

    Thanks for the comment.


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