What was your last max single?
for 315 x 1, assuming the last time you maxed it was something like 305 x 1, then I'd go
bar x 20 , 135 x 10, 185 x 5, 225 x 3 ( 3 mins rest between sets)
255 x 1, 275 x 1 (as much rest as you need, 5 mins +)
then hit it