I just did a test run of one of the slugs against a jug of water and WOW.
first off it was LOUD. Probably 10-20% louder than the lead versions i tested last month. 10 minutes later and my ears are still ringing (yes i didnt wear ear pro, it was only one shot)
second it seems like it was pretty accurate, it hit a little higher than i wanted but in all likelihood that was probably my fault since i was nervous and it didnt look like it was tumbling.
and third, it was pretty damn powerful. Despite it hitting high on the target (and thus not going through as much water) it still did a TON of damage, enough to be comparable to the lead hollow point prototypes i shot a month ago.
here's some pics from the shoot aswell as a comparison of the damage.