Thanks for the replies guys.

By the sounds of it they'll be a little bit below my expectations. My .223 & .308 will comfortably group 5 shots 1/2" @ 100m. I do shoot out to 600m with the .223 & 1000m with the .308 so accuracy over distance is important.

It was worth asking, but it sounds like I might be wasting my time trying them!

Cheers
Greg