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From what I've seen so far it's negative, my test bbls chambered in 300/221 shoot better than 300AAC chambered ones, mfg and bore spec the samel
As a reference "match" chambers in .223 and .308 both have tighter throat diameter and shorter freebore than std SAAMI spec.
Also there are advantages from loading shorter, especially with 110-135gr supersonic loads such as: fits/functions in unmodified AR mags and full bullet/case neck contact aids in accuracy when fed from a semi-auto
Have test bbls coming in with .3085" diameter throat and throat length optimized for 2.00-2.100" OAL ammo, we'll see??????
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