A very generous gent let me shoot 5 singles targets with his Model 21. His had a high-comb (not Monte-Carlo) custom stock, as well as a ventilated rib. The gun was an absolute thrill to shoot, and it shot well for me.
I hear that Model 21's can have punishing recoil, but this one didn't, at least for the five shots I fired. Since that experience, I occasionally find myself getting weak for one.
I tried it. When I was doing some stock/engraving work I bought a M-21. Made a custom stock just for me. Engraved the gun with some nice gold inlays. I shot 5 pair of doubles from one post. I believe it kicked by brain and a few teeth out of my head. I found the teeth but lost my brain. Sold the gun and and had a custom Holland and Holland made for me. That lasted about as long as my M 21 experiment for doubles. I like side by sides for bird hunting but they are not , for me, trap guns.
I own Cap Grier's Model 21 that John Olin made for him in 1938 after he shot on the world record doubles squad, also shooting a Model 21. Other members of the squad, don't remember how many, also shot Model 21s. Grier was not only a world record type of guy, he was a Winchester company shooter. I am still shooting the gun today, 72 years later. I think the Model 21 is an acceptable doubles gun.
I grew up shooting a Sterlingworth Fox and I accompanied Steve Barnett to the Orvis Vintage shoot several years ago. I paid the fee to shoot "down the line" trap and picked up a high grade L.C.Smith off of Steve's table that felt right and had long barrels and went to the line. Everybody looked funny when I asked if I could fire one round to be sure the gun would work and proceeded to break a 97 and win the tournament. Doubles was a bit toughter until I figured out that you have to hold completely off the side of the house or you will definitely l;ose the target under the barrels. I don't remember my score but I did finish in third place. Recoil is a bit rough with just about any double gun. I have a permanant scar on my third finger of my right hand from the trigger guard of that old fox.
A friend let me shoot his prized M21 for a round of doubles. The gun was choked full and full (it was his dad's duck gun). I shot a decent score of 47/50 and really enjoyed the experience but I don't think I would want to shoot that gun all day. The recoil ssemed to end up mostly in my cheek and I don't think it would take much of that to develope a nasty flinch. If I were fortunate enough to own one of these guns I would shoot it and hunt with it but I wouldn't try to make it my trap gun.
Goatskin, what is that gun? Is it yours? All three of my Model 21 vent rib traps are factory special order guns. Most serious shooters know about parallel combs and correct pitch and order their guns that way. Two of my guns were factory ordered with very high parallel combs. The Grier gun is more of a standard drop, but almost 15" long. A fourth Model 21 vent rib trap that I sold to a friend a while ago also had a very high comb. I sold it rather than shaving it down. No one is asking you to use a field stocked Model 21 for ATA trap shooting.
I've got a Webley & Scott in both 12 & 28ga. I call the 12ga "The Mule" for a few reasons, yup it will slap you in the chops. But man is it fun for 16yd and a round of skeet now and & then. Haven't tried doubles with it, sounds like a great idea for this weekend!
I shot 16's and some skeet with my 21 (field grade, single trigger, ejectors) several times. It was a kicker with light 8's...never did try doubles with it...should have....sold it 4 years ago. I miss owning it...not shooting it...