Looking for experiences with this combo and powders you might recommend/avoid.
Stuff has gotten to rare and expensive to waste!
Thank you!

Sorry I never went that high. 130 was the heaviest I used H110 and 4227 were the powders.

Here are some jacketed loads you can start with:

4.3 grains Unique, CCI 500 primer with a Speer 147 grain Gold Dot bullet gives 954 fps.

5 grains of Power Pistol, CCI 500 primer with same bullet gives 975 fps.

5.8 grains of Blue Dot, CCI 500 primer with same bullet gives 1001 fps.

I've shot 150 grains cast with 4.5 grains of Unique. Make sure if you work up a load to stay with the same brand cases as 9mm varied a whole lot in thickness from brand to another in addition to all the foreign cases and military. A safe load in a thin case may not be so in a thicker case.

Hodgdon online data has loads for their powders for the 147 grain jacketed bullets. The loads I gave you are Alliant powders.

147 gr cast lead Missouri Bullet Co., 3.4 gr VV N-320, Win SPP, WCC case. 25 yards from an STI 5" does this occasionally but is a solid 2" load:

I liked Power Pistol, Blue Dot, and Longshot in my 9mm loads for all bullet weights.

The February issue of Handloader had an article on reloading for the 9mm by Bryan Pearce with about 200 loadings for all different weights of the 9mm including the 147g.

Accurate no 7 and a 147 hard cast, my standard load in my hi-power.

Appreciate the comments.
I had forgotten about the Pearce article in Handloader, looked it up, it did not trial cast 147's, only 124's.
Looks like Power Pistol and AA7 might be good candidates for further work. There doesn't seem to be anything than Blue Dot doesn't somehow work in.
The OAL is a little maddening in this cal.

For paper or plates I use W231 with the 147's in my M&P. Very economical to load with cast bullets.
C.G.B.

Would 3.5 gr of 231 inder a 147 gr flat point cast loaded to an OAL of 1.1" be a good place to start?

I'd pick one of the powders mentioned by me or the other posters. Hodgdon's data doesn't list WW 231 for the 147 grain bullet. Remember that WW 231 is a pretty fast powder, faster then the Unique powder I mentioned, so I wouldn't start with that load you posted.

Cast bullets are a bit more forgiving than jacketed. In my M&P 5" bbl 3.7 W231 clocked 920 fps, oal was 1.175. If I were buying powder just for this I probably wouldn't start with W231, but I have a bunch of it and it works well with the 124's also.
C.G.B.

Cast bullets don't have the engraving pressure that jacketed bullets do, but they occupy the same space in the case and 147 grains is 147 grains no matter what the material is. WW 231 is a very good powder for the lighter bullet weights albeit cast or jacketed.