My wife shot a G43 rental at the range and did not like it one bit. According to her, it was "very squirmy."
Anyway, to the OP's question: I have ordered quite a bit of ammo from www.sgammo.com. Federal AE, Lawman, S&B, PMC Bronze. All of it has been very reliable. Shipping has been fast.
On the other hand, I recently had to buy a quantity of Federal Champion 115 for a class from WalMart. I had 4 FTFs in the class (approx 700 rounds over two days).