My understanding of this thread's updates.
With further, and probably important info from the OP, the ammo is indeed "reloaded" or otherwise loaded by the OP, himself.
Also, whether the ammo works well in a Hi-Power ("HP" for short; a FEG Hi-Power, btw, not an FN/Browning) seems to me to be inaccurate, as the OP further clarified the HP hasn't been feeding 100% lately with "nosedives" for an unknown reason.
My opinion is, and the OP isn't the only one to have done this, the comments regarding Glock being picky about ammo feeding and the OP being unimpressed, is mostly showing the OP's frustration and disappointment with the entire situation.
I don't know what the OP paid for this new Glock, but whatever it cost, it was probably some multiple of hundreds of dollars. I totally understand the disappointment and hurt when I've spent hundreds (sometimes, for me, thousands) of dollars and then whatever I've bought isn't working 100%.
I also get somewhat butt-hurt when I hear someone (unfairly) talking badly about Glock, as it's one of my favorite brands. To repeat something I said earlier, some folks get really attached to their particular self-loaded ammo (I hesitate to use the word "reload" as to me, this implies some component, usually the casing, was previously used/loaded). In these instances, when the ammo doesn't work in a new gun, the person often blames the new gun instead of merely trying brand-name-factory FMJ ammo. I'm not an ammo (re)loader and I've never had that emotional attachment to ammo. As a long-time Glock owner/shooter/user (almost 30 years with Glocks now) I have the opposite feelings of, if the Glock and ammo aren't working, I'd initially suspect the ammo. I actually don't know how many Glocks I've had; maybe 20 over the years, and I've just bought another today.
OK, carry on everyone, although this has turned more into an ammunition reloading thread, but we've still not even seen pics of the ammo or this (alleged) plating/lead build-up in the barrel.