A full list of weapon mastery rolls for each weapon type and tier. With thanks to the Defiance team for helping with the data.
All individual weapons pages also have their own tables
Possible Mastery Rolls for BMGs
Common Mastery Rolls
x0.97 BMG Heal Cost Per Target
x0.97 Reload Time
Uncommon Mastery Rolls
x0.94 BMG Damage Cost Per Target
x0.94 BMG Heal Cost Per Target
x0.94 Reload Time
Rare Mastery Rolls
+15% speed boost for 5 seconds after a full reload
x0.91 BMG Damage Cost Per Target
x0.91 BMG Heal Cost Per Target
x1.03 BMG Heal Per Target
x0.91 Reload Time
Epic Mastery Rolls
x1.1 +10% Movement Speed
+30% speed boost for 5 seconds after a full reload
x1.2 -20% Reload while standing still
x0.88 BMG Damage Cost Per Target
x1.04 BMG Damage Per Target
x0.88 BMG Heal Cost Per Target
x1.04 BMG Heal Per Target
On full reload, reduce EGO Power cooldown by 5 seconds
x0.88 Reload Time
Legendary Mastery Rolls
x1.15 +15% Movement Speed
+45% speed boost for 5 seconds after a full reload
x1.3 -30% Reload while standing still
x0.85 BMG Damage Cost Per Target
x1.05 BMG Damage Per Target
x0.85 BMG Heal Cost Per Target
x1.05 BMG Heal Per Target
x1.25 BMG Link Range
On full reload, reduce EGO Power cooldown by 10 seconds
x0.85 Reload Time
Supreme Mastery Rolls
x1.2 +20% Movement Speed
+50% speed boost for 5 seconds after a full reload
x1.4 -40% Reload while standing still
x0.82 BMG Damage Cost Per Target
x1.06 BMG Damage Per Target
x0.82 BMG Heal Cost Per Target
x1.06 BMG Heal Per Target
x1.3 BMG Link Range
On full reload, reduce EGO Power cooldown by 15 seconds
x0.8 Reload Time
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