I havent tried the 6mm/284, but my previous .224 Clark with 25.5 inch 10 twist barrel reached about 3,830 fps (275,000 rpm) with the 75 Amax.
Prior to testing, I thought it had a chance, but unfortunately not even one seemed close to stabilising, so based on that I would be fairly confident that a 22/6mm producing about 3,700 fps would have little to no chance.
I read somewhere that some researchers found that the .224 75 Amax needed about 280,000 rpm to stabilise, shot best at around 290,000 rpm, and usually destructed at or before 330,000 rpm. If that is true, you would need 3,900 fps in your 22/6mm just to achieve 280,000 rpm, and 4,000 fps to reach 288,000 rpm.
I suggest that you follow the advice of Kirby, and just choose a 1 in 9 twist to be sure.
I haven't even been tempted to try the 75 Amax in my current .224 Clark with 6.5 twist barrel, as I know what would happen.