Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
3.5-5% Strength for 3.5s on Hit. Stacks 5 times.
5-6.5% Strength for 3.5s on Close Range Kill.
7-10% Reload Speed for 2.5 seconds after Close Kill. Stacks 5 times.