Its not done it was just cut with a 1:12 twist from Howa which is very limiting.Is the barrel done or do you just want to change it? You can rechamber the barrel if staying with .224 caliber. 22/250AI. What I am not sure of is if the action is long or short? If long and having to change out the barrel, then that open up a whole lot of possibilities. You are saying you are looking at hunting Deer and antelope I would step up a caliber or two. Something in 6mmAI Rem , and a faster twist (7 to 1) and go to hammer bullets. The case is longer than the 243 for more powder. Case fire formed from 6mm Rem cases. Barrel length 26"+. Hard choice!