Really nice looking rifle! Check over on the ASSRA site.
Yes, there's a sticky on ASSRA in the For Sale section at the top. ssdave is selling a bunch of new old stock Jameison brass and I believe he had some in this cartridge.
Any 44 model with double set triggers is a very rare gun. I see far more 44 1/2 than 44 with set triggers.
edit-I just checked and Dave doesn't show the .22-15 cases anymore on his list. Only other source is Rocky Mountain Cartridge for lathe turned brass. And it's very expensive at around $5-$6 per case last I checked.
