My stats:
Attak Power: 36065
Weapon Dmg: 16395 - 24594
PvP-Power; 44,93%
Passive: 25% More dmg http://de.wowhead.com/spell=12712/kampferfahrung
Test target: Warlock
Armor: 25.05% Physical dmg reduce
PvP-Resilence: 75%
Test: 1 Smash hit: 25658 2 Smash hit: 28959
Calculated dmg: http://de.wowhead.com/spell=1464/zerschmettern = 275% Weapon Power + 3427
maximum dmg; = 71060,5 + 25% = 88825,625 DMG
(((88825,625 / 100) * 25) / 100) * 144,93 = 32183,74 DMG
(32183,74 / 100) * ~75 = 24137,80 DMG This is what the enemy player should take on dmg
I am not sure if this is 100% right, if i forgott something or if i done something wrong pls tell me this i will edit this.
If this is right i will link it on bugtracker.