It depends on monsters you fight. Some monsters have 60-80 at their lowest resist.Also: armor pierce vs armor ignore? Trying to decide on a Composite Bow or a Yumi for my main bow to use. Anyone have any math done on which is more effective?
Armor Ignore always does 100% of damage.
Armor Pierce does:
80 res: 30%
60 res: 60%
40 res: 90%
20 res: 120%
0 res: 150%
I don't know how it ineracts with 300% cap. The easy way to test it is to try it vs Fire Damage in The Abyss dungeon (-5% cold res), check damage you do with EOO+CW+Daemon Slayer and compare it with the damage shown in your stats.
Yumi: 13-17 damage, 3.25s
Composite Bow: 16-20 damage, 4.00s
With a Yumi you can easily get 1.25s without SSI on your weapon: DF + a turq ring. With a Composite Bow you need additional 25 SSI to get 1.50s (but you do 20% more damage per hit).