Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
14-20% Impact for 2 seconds on Repeated Hit. Stacks 5 times.
7-10% Reload Speed for 3 seconds after Close Kill. Stacks 5 times.
4.5-6% Close Range damage on Repeated Hit. Stacks 5 times.