i generally load 50, 55, and 60 gr' Hornady spire points for my .223 Handi's. i can tell you 'straight-up' that if i long-load a round, not following the SAAMI coal' guideline that the round won't chamber properly. i get marks on the bullet from the lands biting into them when i close the action. for sure that happens on my bull-barrel'd model, and maybe on the regular one, too.
i have had to re-seat the bullets in those cartridges to a shorter, proper coal' in order to get proper chambering. i don't see where these "long throats" are a reality.
by the way, both of these rifles have been very accurate, with the heavy-barrel'd rifle as accurate as you could possibly want. i just don't see where NEF is producing a lot of problem rifles. i think there are a few percent that may be problematic, but am guessing that Most of them are properly made.
mine were.
ss'