Ray, were you able to find any of this brass?
I remember reading in "Precision Shooting" when this brass first came out. Maybe you might have better luck asking on some of the benchrest bulletin boards.
Also, there are 2 other avenues you could take. Rocky Mountain Cartridge (I think that's their name) in Cody, Wyoming, can make up this brass for you, with whatever size primer pocket you want. This brass will be lathe-turned, and may be expensive (like $2 or $3 per piece), but if you only want 20 rounds to experiment with it may be worthwhile.
Also, there is an outfit in western Wyoming (I think it's Freedom Arms?) that sells primer pocket inserts which enable you to use a small rifle primer in a large primer pocket. They sell for around $17 per 100. I think they were originally made so that shooters could use SR primers in the 45 Colt.