It all depends on what your definition of "precision rifle" is and what you want to use it for. For classic "hog" busting the .223 is the way to go (although there are a number of other calibers that will fit this bill -long list but I will stay within the confines of the two cartidges you mentioned previously). Low recoil, relatively cheap and good to approx 300 yrds (shooter dependant).
If you are looking to get into the long range game the choice becomes painfully clear - .308
Yes the .223 has been used sucessfully out to 1000 (I have used it and know a number of folks that still do) with 80 grn bullets, but to get the 80's to stabalize consistently at 1000 you need a 1/7 twist bbl. Further most fullbore rigs have bbls 28-30" long which are not present on factory rifles.
Since the DCRA has went to handloads the use of the venerable .223 has diminished dramatically out past 600 yrds and the .308 reins king. Keep in mind this is in the TR class where your only choice is .223 or .308
Assuming you want to get into the F-Class game there are better choices - 6 mm comes to mind.
Bottom line - get the rifle which best suits the type of shooting you intend it for, use it often, have fun and put many rounds down range
If you are looking to get into the long range game the choice becomes painfully clear - .308
Yes the .223 has been used sucessfully out to 1000 (I have used it and know a number of folks that still do) with 80 grn bullets, but to get the 80's to stabalize consistently at 1000 you need a 1/7 twist bbl. Further most fullbore rigs have bbls 28-30" long which are not present on factory rifles.
Since the DCRA has went to handloads the use of the venerable .223 has diminished dramatically out past 600 yrds and the .308 reins king. Keep in mind this is in the TR class where your only choice is .223 or .308
Assuming you want to get into the F-Class game there are better choices - 6 mm comes to mind.
Bottom line - get the rifle which best suits the type of shooting you intend it for, use it often, have fun and put many rounds down range