All you would have to do is a search here of the archives. Ultramax has blown up several rifles and pistols.
I will NEVER shoot Ultramax.
You have the 'tards who come in and say "I shot 1000 rounds of Umax and it was fine.... I will buy more, and think ya'll are FOS"
The experiences of shooters here equal hundreds of thousands of rounds... and create a sample size where ammunition reputations can be un-statistically analyzed. Life it too short to mees with ammo that has a rep. for blowing up guns.
Tick, tock, tick, tock, tick, tock, BOOM.