As cc said what gun are we talking about?
Standard pressure ammo should work fine.
I am not a fan of +P or +P+. If you need more velocity or power get more gun.
Why? Why should I switch calibers because I don't like the ultraconservative, underpowered standards set by SAAMI? NATO ammunition is anywhere from 4% to 12% higher than SAAMI, in comparison.
A well made, modern firearm such as my HK P30 will have no issue with +P ammunition. It's only a 10% increase in pressure, which is hardly anything to write home about. (35,000 to 38,500 psi and the 9mm can handle up to 44,000 psi)
IMO, non +P 9mm ammo is underpowered. The reason we started adding pressure to the 9mm was to increase terminal ballistic performance from the original standard set in 1902. (Which it did!)
When shooting 147gr 9mm, there is no reason not to use +P, as 147gr was intentionally made to be "soft shooting." My practice ammunition(s) (115gr Federal Champion or my 124gr NATO Winchester Ranger) shoots hotter than than my Federal Tactical HST 147gr +P carry ammunition. (NATO pressure is, with rare exceptions, lower than +P).
I say the above as I tested both the 147gr standard HST and 147gr +P HST at the range in depth; I fired 150 rounds of both to test for differences in accuracy, follow up shots and recoil, and the differences would have to be measured microscopically, as I couldn't discern any.
My .02