The fastest way Ive ever upped my bench, as simply putting the weight on I WANTED to bench, and went at for 6 sets.
If you want 250 on bench, then make your body do it. Put on 250. Have a spot help you keeping your form. See what you can do. 5-6 sets, 2x weekly. Write it down so you can see just how fast this will work.
IT's great for shock
Reps would be like 3-4(first few sets), or sometimes 2, but I did 6 sets (with a spot of course)
Your body will adjust to the DEMAND. ...Place that demand there.
(THis is good up to the +40lb range about, Im not advising anyone to throw on 250lb on the bench, when you cant press 200 of course)
I got a nasty increase in size, and was doing the first 3 sets unassisted, 6 reps last time I did this. It's not as taxing as you would think on your body, becasue the reps end up being so low. I worked bench twice a week. Did this technique for squats also.
3 weeks and you should be noticing your completeing at least the first 2 sets of 6 reps unassisted.
Play your diet according to how your feeling the next day.