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The whole reason for the 147 grain 9mm load is to keep the bullet subsonic as it leaves the gun.
The speed of sound is approximately 1100fps. This changes with elevation, air density or barometric pressure (these are really all one in the same factor, but forgive me for being thorough!)
Subsonic rounds do not leave a signature 'crack' of the bullet making a sonic boom. For this reason, they work great in suppressed weapons.
147 grain bullets do not leave much room in the case for powder if one observes OAL limitations. You will run in to pressure problems real quickly if you try to increase power levels.
To sum this all up, a +P 147 grain loading for 9mm is NOT a good idea. Try going with a 125-130 grain bullet if you think you need more speed and a heavier than 'normal' 9mm bullet loading.
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Remember, just because you are not paranoid doesn't mean they are not out to get you!
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