About 20 years ago me and my nephew tried about every 22cal possible. we tried a 22-284 that is just slightly larger capacity than a 22-6mmAI........you will never get the speeds you think you will and the barrel will be half shot out by the time you work up a load. Biggest I will go ever again is a 22-250AI with 1-8" twist. about 5 times the barrel life and you give up very little velocity.
Pretty much the truth. I had a .22-6mm made up in a 26" barrel, and my experimenting has lead me to using Norma MRP with 75 grain bullets. I still cannot manage less than 1" groups at 100 yds, though...not impressed thus far.
