yes,  I have one.  There have been several others at the matches at Etna Green. the gunsmiths at Johnson's Gunshop in Adrian Michigan (advertise in the Journal) did mine and a few more in the past couple years.  I have been told of other gunsmiths who have done it as well.

It basically consists of rebarrelling or relining the existing barrel, rechambering, and modifying the block/link to move the firing pin strike to the rim of the cartridge.  In addition the extractor/ejector will have to be reworked and on mine that proved to be the trickiest part of the process. In principal it is a simple process but complex if done properly.
 I think any skilled gunsmith who works on Rugers regularly could do the job if allowed the time to figure out the details.

Mine was done more or less as an experiment using an ASSRA-marked #1 action in combination with a barrel replacement, tight match chamber, action tune  (Steve gave me a an ultra-crisp 2# trigger while retaining ALL of the factory parts--except a Zika speed hammer set)   I could not possible be happier with the rifle.  I use it as a bench rifle for the 200 yard rimfire matches.  With premium ammo and in the hands of a more skilled "wind-reader" I'm convinced it could be a winner and maybe a record setter.

The other one at Etna Green this past weekend was based on an ex-45-70 #3.  I'm not sure about the barrel set up and as I recall the internals had been simplified somewhat.  It was the first match for that rifle and I don't know how well it was shooting.

I asked Steve if he was doing other rifle work besides for Ballard's.

He told me Yes, but all work is done though and billed through Ballard Arms

Ballard Arms
9562 Sand Lake Hwy
Onsted MI 49265

517 467 6560

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DWS8130 - Just crious is the block brought up further or not as much in order to align witht the rim?

DW, The item is called an 869 Cartridge tray it is made by gehmann. It is two sided and top heavy. I cut and then sanded the bottom side off and it's perfect. I have also seen them inletted into larger blocks of wood for stability. I beleive I bought them from Champions choice in TN. 
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email sales@champchoice.com
(615)793 - 4066

Reply to the Ruger # 1 Conversion,
I have one that John Korzinek of Canton, PA built around 1995, very, very, nice job. He used a 22 inch Shilen chrome molly match barrel with a tight match chamber, speed hammer, set trigger, color case harden receiver, lever etc. very nice gun.

This one is set up with the block in the low position so that it gives a 6 o'clock firing pin hit, it seems that most of the big time 22 caliber bench rest shooters think it's much better than a 12 o'clock hit. I really cant say how much better as I don't have anything to compare it to, it will shoot in the .2's at 50 yds and under one inch at 100 yds on a nice day with the right ammo.

Donor gun was a 243. The firing pin is the original center fire pin so the block did not have to be modified in any way and the gun can be put back to center fire without much trouble, only things needed would be the barrel, the longer breech block arm or link to raise the block to the original center fire position because the original was shortened for the 6 o'clock hit, and a extractor for the center fire cart.
Shooter

Hi  Irascible,
About a year and a half or so ago he was. I don't know about now, I tried to get hold of him recently, he did such a nice job on my # 1 in 22 LR that I wanted  to see if he would do up a ASSRA legal center fire # 1 for me so I would have a matched set but haven't had any luck getting hold of him, the phone number I had for him is no longer working.
Shooter