223 REM to 220 SWIFT?

[Catfish]

I agree that eather should work well with the changeing of the extractor. As for the 1 in 9 twist that aslo will be better in the .22-250 or the Swift as it is better suited to heaver bullets. With the 1 in 9 you should get your best accuracy with bullets in the 55 gr to 69 gr. range. While you can`t push the 69 grn`s as fast the better BC of the bullet and less wind drift makes them a very good choice for longer range shooting.