Georgia Arms makes some of the best ammo avaiable. Period. Have no concerns about quality.
I've bought thousands of rounds from them, over the years, and will do it again. (They ship in bulk, using waterproof surplus ammo cans, which can be handy, later.) They'll also buy back empty brass -- but the economics, given shipping costs, may not be advantageous for you.
As for the 40 +P: you might ask them about it -- they have an email contact address, I think.