Can anyone explain why the rifle manufacturers typically put a 1:12 twist on a 22-250 but will put a faster 1:8 twist on a 223 Rem? I know that the 22-250 was developed as a varmint rifle and as such usually uses 40-55 grain bullets just fine. But the 223 has been in use out to 6-800 yards with the heavier bullets in the 60-80 grain weight. There are even hunting style bullets available that I would think would benefit from the additional velocity of the 22-250 but probably won't stabilize because of the slower twist. Is a custom replacement barrel the only solution for using the heavier bullets in the 22-250? Thanks for your insights.