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One of my general purpose rounds with the 115g RN bullet is 4.0g of W231 (W231 & HP38 are the same powder). It's a great shooting/practice round that is accurate and will cycle your gun with no trouble.
This load yields:
966 FPS through a Khar CW9 (3.7" bbl)
1046 FPS through a Baretta 92SF (5" bbl)
So as you can see, it's not a rocket-hot round. Just an excellent GP shooter.
Unique is a good choice too. And as WESHOOT2 said, it gives a little more forgiveness because it's slower; if you feel an extra level of safety margin is important.
As far as Blue Dot goes: pressure isn't the problem. It's just too slow for the bullet weight and application. Don't bother. With 9mm, I'd only use Blue Dot with 147 grainers.
As far as OAL goes: You need to perform a "plunk test" with your MP9 and that Berry's bullet, to find the correct OAL. It's not something you should adjust. Find it. Set it. And forget it.
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Gun control laws benefit only criminals and politicians - but then, I repeat myself.
Life Member, National Rifle Association
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