I have two .243 AI Rem 700 SA rifles, one sporter contour and one Varmint contour. These are factory barrels re-chambered to AI before the 6XC or the 6 Creedmoor existed. I also have a 6mm AI re-chambered factory 6 mm sporter contour barrel on a Rem 700 long action and a 6 Creedmoor Lilja barrel on a Rem 700 SA. I did the AI conversions to eliminate trimming and change the tendency of the .243 to erode throats. Been happy with the .243 AI chambers, but I really like my 6mm AI compared to the .243 AI's , but today, I would do either the 6 Creedmoor or 6XC. My 6mm AI is incredibly accurate and regularly shoots to 800 to 1000 yards on gongs and prairie dogs. My 6 Creedmoor does similarly. Personally, I think there are currently better options than the .243 or .243 AI.
