Excellent advice from Wes. It's all about the total number of reps done for a muscle area, broken down to sets (brief pauses between those reps). And most times, a lot of extra reps are not needed at all. 5X5's can suit most , for a time.
Offering a couple of things not generally done in regular BB'ing: Wave or Oscillation strength workouts. Where the muscles get accustomed to handling a much greater weight, than back to normal weight, greater weight weight, etc, etc, etc. And all in the same workout.Works well for strength athletes and power sports like football. Pretty simple concepts to put into action.
If you have a PR, might try these: Being a PR guy, and a little bias, I might suggest a 3 position pin partial rep training as a first choice. Seem some remarkable quick power increases in the bench, DL & squats with this protocol. These heavy duty workouts seem to help increase muscle mass very well indeed.
Keeping it simple:
1st position..top) Place the bar pins around 2 to 4 inches from your top lockout position. Probably can use around a 100lbs over the your regular BP. Than just lockout.
2nd position..middle) Place the bar pins around 6 inches off the chest. With the other set of pins, place them around 4 to 5 inches from the bottom pin settings. Press up to the upper pin settings and back down to the bottom pins. Find the middle portion of the BP is the weakest for a lot of people. Adjust the weight to your needs. You will get much stronger in this middle range, than you might have though possible.
3rd position..bottom) Set the pins touching, or as close as you can, to the chest. Set the upper pins to 4 or 5 inches from the bottom pin settings. Press to that upper position and than back to th bottom again. Another very weak position for a lot of people.
Do 2 sets, each position, of 4 to 6 reps. That's 6 sets total. Than do a couple of regular light sets of your normal benches for 8 to 10 reps. Twice a week for all of the above, getting a much heavier workload than you are use to. Good Luck.