Yes! - During the month of July (2001) I called the factory looking for the Vaquero Birdshead Model shown in their catalog. At the time their catalog has a 5.5" barrel version ... but according to Ruger reps none of these were ever manufactured and/or shipped. They promised the 3.75" barrel version was coming soon. After numerous phone calls to the Ruger factory I found success in September (2001) and had my dealer order one from an AZ distributor. Glad to report it exceeded my expectations! In fact, I bought another one a month later. Both of my Birdshead models are stainless steel and fit & finish is EXCELLENT. Barrel gaps are .003 and .004.
My range report is limited. Shot some Mag Tech LRN 255 gr and found acceptable accuracy. However, this stuff is rather nasty, leaving residue, etc., - being of Mexican manufacture I assume it contains left-over taco sauce and chilli peppers.
The best accuracy was with Remington (R45C1) - 225 gr SWC which produced sub-2" groups at 15 yards. (With my 56 year old eyes and that shiney front sight this is considered acceptable).
So far I haven't fired the second Birdhead, but based on the first one I have high expectations. During the past months I've accumulated various Federal, Hornady, Winchester, and "off-brand" factory ammo. I also have some Speer 260 gr JHP bullets for reloading. Looking forward to some more range time as soon as the weather improves.