So i was messing around with tier 16 in the PTR (you can get it in Niuzao Temple for free)
Not much to say about the 2 piece, feels extremely useless when we have things like readiness, and in places outside long boss fights even more so (trash,quest,duels,farming..etc)
tried the 4 set as BM and i don't think you can get past 9-10 stacks because of the global cooldowns so you will never reach 15 unless you beastial wrath twice with readiness (the 4p bonus buff lasts the same as beast within and no longer, but the damage you gain stays 2 sec longer) seems broken.
as survival i managed to get 20 stacks of extra lock and load uses without procing lock and load (no black arrow, and 20 stacks is max stack it just resets timer back to 1 minute after 4 set procs) , when i did proc lock and load you can only use around 12 of them because lock and load only lasts for 12 seconds ,got close to 200k explosive shots no big cooldowns or buffs used not sure if damage stack caps with explosive. (imagine starting a boss with 20 stacks lol)
anyways did not do much testing because of the constant ptr disconnects every minute or so.