The 22x6.8 or specifically the 22 DTI, was a huge disappointment for my cousin. Contact Mike at Dedicated Technologies and ask him about the velocities you can get. He was spot on with his max load data and none of them were close to the 22-250. My cousin thought he was just being conservative but he wasn't.
I don't know how the 22 Nosler stacks up just offering this as food for thought.
I believe Olympic Arms built a lower that was a little bigger than a standard 15 and chambered the 22-250 for it. I never saw one nor heard much about them after the initial sales pitch but they are now going out of business.
Maybe the AR-15 is best in a lighter, handy gun in 223 after all...
