I've shot 55 VMaxes from an 8 twist at 3250 fps with good results. They were consistently .6" shooters. I had no luck at all with 40's, but OTOH, I didn't try real hard to work up a load with them. I'd say my average with them was 1.25", but like I said, I didn't spend much time trying to work up a load with them.
Mike