This might be a bit of old news, but I just noticed on the Tikka website (
http://www.tikka.fi/) that they have
finally expanded their product line to include the .204 Ruger in a number of popular T3 models (Hunter, Hunter Stainless, Deluxe, Lite, Lite Stainless, Camo Stainless, and the Laminated Stainless) and some of them (Hunter, Lite, and Lite Stainless) will be available in left hand. All are 1-in-12 twist.
The Beretta USA site does not appear to have been updated to show these new .204's and so I'm assuming there aren't any available in North America yet, but I expect that will change soon.

The art of war is simple enough. Find out where your enemy is. Get at him as soon as you can. Strike him as hard as you can, and keep moving. - Ulysses S. Grant (1822-85)