For me 405 comes at about 10 reps with 3 plates. However I don't progress well if all I do is 8-10 rep stuff, I have to do heavy single/double/triples in my routine. Even if they aren't to failure I like heavy double/triples, especially if warming up for a max attempt.
Attempting 4 plates though I would probably do 2 quick reps with 3 plates as part of my warmup, and if I felt injury free I'd go straight for 4 plates after a 3-4 minute rest (I rest a lot on heavy days).
135x15
135x10 (optional if I feel I need extra warmup)
185x8
225x6
275x4
315x2
365x1 (if coming off elbow/shoulder problems)
405x1