Back / Front / Box squat / step-ups ratio

[anthrax]

From your experience what is the ratio between those lifts?

For me

if back squat = 100 then
Front squat = 75
Step-ups = 130 (yeah, my barbell step ups is heavier than my back squat )
Box squat = 130

 

[KillahBee]

if back = 100
Zerchers (never did front sq) = 50 (the arms give out before the legs)
Step-ups = 90-110
Box = 125

 

[coolcolj]

frontsquat is usually 80% of a oly style back squat

 

[Bonkme2]

You guys can box squat that much more than a normal squat?

Am I doing something wrong?
I can prolly hit 405 for a full squat (1x), but there's not way in hell I can do anywhere near that on a box squat. Maybe 275. What is that...65% to 70%

Apparently I need to concentrate a little more on driving out of the hole.