Quote:
Geezer - make it 4 verification's - do a cast of the chamber

I recently bought what is suppose to be a Peterson #4 barrel. It has the Schoyen style rifling. It's only providence is a set screw, type mark, ahead of the forearm screw, on the bottom flat. Does yours have that?

It's 38/55, with a 2.125 chamber and throated for the Hudson bullet. 

Frank

Redsetter ... 

I always wondered why I thought Redsetter is a nice guy ......

I've been a fan of George C. Schoyen for many decades, and am always trying to examine every Schoyen I can at any place I can find one to inspect. I've known John Dutcher casually for as long as I've been interested in Schoyen rifles, and never heard him mention unmarked Schoyen barrels? I've never had a Schoyen handed to me to look at that didn't have his roll stamp of "GEO C SCHOYEN DENVER, CO" on the top barrel flat. 
I wont say "never" as there are far too many Schoyen barreled guns out there that I've never seen. But I would be skeptical of any gun presented to me as a Schoyen that didn't have his rollstamp.
Schoyen rifling is very distinct, and I've not seen anyone doing exactly the same. If anyone might be close I"d guess it would be Barry Darr, as I've been told he too was a Schoyen fan, and did similar rifling. Not sure how close Barry's is to Schoyen's, but might be very close? 
But basing a gun maker's work simply on rifling style wouldn't give me a warm and fuzzy feeling. If the gun was cheap enough to not matter, then I'd be OK. But if I'm buying a Schoyen it better have his stamp on the barrel, or be a huge bargain without it. I own three Schoyen rifles and all have his rollstamp on the barrels.
Two of mine are .32-40, and one is a .38-55 Ballard. The .38-55 takes full length cases just fine, and twist rate is 1:15" which seems to be pretty standard for Schoyen's .38-55 chambered barrels.
If you have John Dutcher's book, he shows images of Schoyen's rifling on page 347. You'll notice the wide grooves and narrow lands, plus right hand twist of his rifling. You'll also notice Schoyen's cutter was convex, not squared off like Pope's, so Schoyen grooves are parallel to the bore and curved in the bottom of the groove. Not flat bottomed like Pope's cutter left the grooves.
John Dutcher does not take phone calls as he can't hear well enough to talk on the phone. He doesn't do email that I know of either. He might answer a letter if you sent him a question, and put a self addressed stamped envelope inside to return to you. A simple Google search for John Dutcher will bring up his address. I probably wouldn't drop by without arranging by letter, but it will give you a place to send a question.

My rifling style was copied from Geo. Schoyen having either 7 or 9 rifling grooves and uniform rh twist. All rifles fitted with my barrels in my shop were ALL stamped  B.W. Darr. I did however sell a few barrel  blanks to several reputable and capable gunsmiths. A check of my barrel record's did not reveal doing business with Mr Garbe. John Dutcher would be the go to man to help identify your barrel.
B.W. Darr

Since I haven't slugged any other Schoyen .38-55 chambered barrels, I can only comment on mine. But mine runs .381" and loves the old Doc Hudson Ideal mold I cast with. 
The Schoyen Ballard it's fitted to was the first custom schuetzen rifle I ever purchased, and I had no idea who Geo. C. Schoyen was when I saw the name on the barrel. Fortunately the gun shop selling it didn't either, so the price was very affordable. The shop owner actually stopped me as I was pulling my money out and said, "Before you get in too big a hurry; I want you to see some "idiot" put his name on the barrel!"
I looked at the rollstamp and thought it looked way too nice to be some owner marking his name on it. Got home and called a friend who was far more knowledgeable than I was, and he came over to look at the gun, and filled me in on what I'd purchased.
Sometimes a lack of knowledge can be a benefit on the buyer's part. Had I known more, I'd probably never gotten the Schoyen; or at least at the price.