I do 1 set of 5 reps, then 2 sets of 3 reps each with a heavier weight.
1x5 - 310 lbs.
2x3 - 325 lbs.
I'll be lifting that when I get home from work. Your 5-rep max is about 87% of your 1-rep max (1RM). Your 3RM is about 92% of your 1RM, and it's about 15 lbs. heavier than your 5RM. Lifting at or above 90% of your 1RM will build significant strength. My 1RM in May became my 5RM in July after I started lifting this way. I use the same method for bench press and squat.
I would recommend starting out doing 3x5. Build up some strength, and more importantly, perfect your lifting form. Then move up to heavier weights.
"Don't waste your time, or time will waste you."