Family has a history of bad backs, but at 175 today I box squatted:
210x10, 225x8, 266x15 (supposed to be 6 but last set is always to failure in the program I'm on).
The only reason I did such a little amount of weight is because my bar is a regular 6' straight bar. The most if can hold is 266. I'm getting an olympic bar for X-mas, so then we'll see what I can do.