There was an Indiana gunsmith that built ARs and bolt actions in a similar cartridge that matched the velocity of the 35 Remington with 200 grain bullets IIRC. I don't remember his barrel length. There's a link in the thread to a very old article about a converted Mini-14, different versions have been around a while.
http://forums.accuratereloading.com/.../828107597/p/1
I thought that I read a while back that Indiana was doing away with that stupid law?
Good to see ya here Kurtz, I really like that 6.8 ARK. Kinda slow around here but the low noise level suits my age better then ARF.