17.5% damage from silver bullets and large caliber rounds allows white tec-9 to reach breakpoint to one headshot and two body shot common ridden. 9 x 1.175 = 10.575
+17.5% also allows blue tec-9 to one headshot or two body shot ferocious commons. 10.9 x 1.175 = 12.81.
Confident killer allows purple tec-9 to one headshot or two body shot monstrous common after eight mutations (+8%). 12 x 1.255= 15.06.
CK also lets green tec-9 hit breakpoint for ferocious commons after 9 mutations (+9%) if needed depending on drops. 9.9 x 1.265 =12.52.