Hi Titegroups!
I am in the same boat. I have been working up loads for 124 (plated) 9mm over the last month. I am also a "mainly wheelgun" guy so 9mm was new.
I had bulk 700x, 231, Unique, Clays, AA 2, 5, 7 to use in my Springfield XD compact. Ruled out 700x completely, horrible crap and lousey accuracy. I like clays and Titegroup for clean and lots of rounds per pound, but found accuracy is best with Unique at 4.5gr which gave me 1087fps and 3/4" at 50' with ranson rest. Also, doesn't get gun dirty as everyone thinks with Unique.
I have 10 loads set for 231, AA5, and Titegroup to test next as soon as the monsoon season ends here in Reno. We got 2" of rain in 3 days, which for the desert is WAY too much and will take 2-3 weeks to dry out enough to get to my spot.
Other considerations to keep in mind are that I tested above loads in 88 degree temp at 4886 foot elevation with a shorter barrel so you results will be different, obviously.
If you are interested in sharing more results, send me a message and we can talk through email. Would love to hear your results as well as all the other great opions on the page. Thanks to everyone who added suggestions as I am using too!
John