If you have a bolt, the feed lips in the mag can be opened a little to feed the 22-250 AI. You will need a new mag and follower however. In the 12 twist you might be able to eek by with some 60ish weight bullets, but 55 for sure.
Really need a 10 or 9 for the 69 or a 8 for the 77s.
Gents - I know this isn't a small caliber site, but you guys have supplied some great info . I have a 223 heavy rem bdl - could this be rechambered to 22-250 imp - looking at the twist for heavy bullets ,I found a 250 bolt , will the mag feed the 250 -thanks
BountyHunter - its stock , 12 twist I think ,looking for the heaviest the twist would allow , I have many years and rounds threw this rifle , thought it would be a great way to freshen this up - didn't know if it could be done , if mag would feed etc. - thanks
Hey Old Fart what're you gonna be using those bigger bullets for-- varmints or targets??
FWIW i've had some pretty good terminal ballistics out to 550 on coyotes with the 69 gr. Nosler Comp. out of a 1:9 twist barrel on a AR .223AI @ 3100 m.v.
sscoyote - will be using it for both - with a 12( I think) twist , was hoping for a little better range , better in the wind - wish it was a 9 twist , but I will take it in and see may be go to a 223 impr - set it back and rechamber - thanks