I saw that this was brought up in several old threads, but I havent seen a thread devoted to it, so here you go.
Ultramax is Gawd awful ammo.
I picked up a box of 9mm because it was pretty cheap, and I figured it was pretty hard to f*** up factory reloads, boy was I wrong. First off the brass is in anywhere from B+ to F condition, I found at least 5 rounds that I won't even attempt shooting in the 250rd pack, deeply gouged brass and discoloration where a case looked ready to split were the most obvious problems. The lead bullets were also cheaply cast, but didn't appear to present a safety hazard.
The rest looked at least shootable, so I brought 100rds down to burnsville pistol range along with a box of federal and a box of remington. Well, bv pistol has a no black powder policy and I felt like I might have been violating it. The plumes of smoke looked like I'd just cast an unsuccessful ballot for pope. It produced thick black smoke, that especially after emptying a 17rd magazine, was quite noticeable both in the air and eventually on by hands and face. I'll say this, bvpistol's ventilation system is excellent and sucked all the smoke out within 15-20 sec, but still I felt the need to apologize to the guys shooting next to me.
As for accuracy, the ultramax is second to none, in that it's slightly less accurate than not having ammo at all. The federal was keeping 3" groups at 25' despite my terrible marksmanship, but the ultramax was closer to 6-7" with fliers outside even that awful radius.
In short, this stuff is crap, I'd sell the rest, but I really can't in good conscience. Let my mistake prevent you from making the same.
I will give it up to my new tp-9, as it managed to fire, cycle and eject all 100 rounds flawlessly.