the best way to get a answer is look at what true competitors do .
bench rest guys spend thousands on barrels every year an if there was a way to improve life an retain accuracy they would . I dont see any bench rest rifles with chrome bores .
to do a comparison you would need have identical profiles. chambers, ammo etc . Im told a properly chrome lined barrle has to be rifled differently so that will factor in. super accurate rifles generally have a short break in periond were things smooth out an after they shoot better . with a chrome lined barrel your going to be stuck with what you got.
I have seen some pretty accurate ATs with chromw barrels . I have seen 1/2" groups but in a the target shooting world that is not very accurate .
Im sure there are kept records in classes were AR,s compete as to what the best is . I just doubt yout going to see a chrome lined barrel win in a class were the gun in the major factor in winning .
I know the browning an winchester WSSM rilfes all have chrome lined barrels .
Trust me If I could have a 22-250 barel chrome lined an keep the throat living longer an keep accuracy for a $100 or so more Id do it in a heart beat .
I have to rebarrel my 22-250 bolt action target gun an Im looking at $400 for a new barrel .