I didn't encounter any problems personally, but I think the main issues were out-of-spec hulls that were either too long or too thick -- wouldn't chamber, or once chambered wouldn't extract. I think Brenneke problems were written about here on the forum as well, no? I can only find one thread on a quick search, but I thought there were more...
Ours were the "tactical home defense" load. I have a vague memory of reading about different Brenneke loads (or components) being made/sourced in different places, and one of those being troublesome..?
Sorry I can't be more precise; I had no problems with the stuff myself, only saw one other shooter with a round that wouldn't chamber, then was told it was a frequent enough problem that we were going back to Federal. I'm actually an instructor in the shotgun program, and only saw it once in a class I happened to be working.
It has been a while, and possible my recollection is fuzzy, but I think the Brenneke “problems” were reported about the time Federal introduced a new slug. Supposedly the Brenneke slugs were suddenly being made somewhere else, with reported quality issues, even though my Brenneke boxes did not indicate a change in the place of manufacture. I always wondered if the “problems” were perhaps encouraged by a zealous Federal sales guy, although that is complete speculation on my part.
Likes pretty much everything in every caliber.
Here's an example of accuracy from the Truball load – I took this while zeroing new sights. We zero at 25 yards for urban cop work; the lower group w/ red sharpie is at 25 yards, and the blue sharpie at 50. Not my best efforts, but good enough to convince me to stop f'n with the sights!
The Truball is comparable in accuracy to the prior Brenneke THD, with perhaps a slight edge to the Brenneke. Both are significantly more accurate than the older Federal hydra-shok style slug – I use my remaining stash of that for practice only.