Can anyone tell me what twist Savage uses in their .223 barrels? Axis and 25's. do I have to look for a used .222 to get a 1-12 or 1-14 so I can use the lighter bullets? have NO intrest in bullets over 50 gr. the .243 takes over then. also, how light a bullet and what velocity will stableize (or not over stableize) in a 1-9 twist?