Layne Simpson wrote it up several years ago in an edition of Handloader's Digest.
Back then it was known as the 224 Clark based on a necked down 7X57.
Apparently some time after that a Texas gun builder re - named it the Texas Trophy Hunter and used 6mm brass because where he was 7X57 brass was hard to come by. At one time Hornady listed a special bullet for it because of its popularity, I think an 85 gr. 224 bullet.
I believe it was somewhat faster than the Swift and there is no flies on the Swift when it is loaded up.
I'll see if I can find the article....
