My son in law gave me 300 rounds of 22-250 for Xmas that came from a house clean out he did. Got me thinking that a 22-250 might not be a bad idea if it had a fast enough twist. I'm thinking 1-9" should handle up to the 75-77 grainers. But I need a longer COAL to really use the longer bullets. I see the Remington 700s in several flavors chambered in 22-250 as well as 243 and 308. Are the actions and magazines of all of these the same length? Or, would I need to buy a .243 or .308 and re-barrel it to be able to use cartridges in the 2.70 to 2.80 OAL range?