Well....hmm ok. I did put a winking emoji after my comment so that my remark would be taken as joke and not as insult an to you or your beloved 28 but I guess that it didn't work.
Anyway, I didn't say that it would "309-400 rounds to get your dope" YOU SAID THAT. I said "enjoy your remaining 500 rounds," let's not put words in each other's mouths ok?
You don't seem to get sarcasm but my point was that the 28 has short barrel life...something for the OP to consider...that's all, no offense to any 28 livers here.
PS I have a hot-loaded 7mm Rem Mag with 2,500 rounds plus which still shoots clover leaves.