The max attributes, as collected from various high level players via investigation*, are as follows:

• Weapon Speed - 100 (for a total of 100%)
• Max Health Bonus - 1000 (for a total of 1000 health or 1250 when healed by a Medic (Loaded Healing 3 or hi) )
• Max Adren Bonus - 700 (for a total of 700 max adren)
• Damage Bonus - 290 (for a total of 145%)
• Damage Reduction - 350 (for a total of 175.5%)
• Max Ammo Bonus - 599 (for a total of 699% of your normal ammo)

* Disclaimer : Percentage figures for Damage Bonus and Damage Reduction may not be accurate.