9mm Is a tricky one to load yourself. Like everyone else said some manuals will have a starting load that is higher than anothers max load. The main reason is SAAMI spec ammo for 9mm, even at its highest pressure is nowhere near what the original specs are. CIP in Europe has a much higher 'standard' pressure. I have a CIP loading manual that has starting loads that blow away the "hottest" SAAMI loads and they even have published loads that push a 147 OVER 1200fps from a 4" barrel. That published load makes IPSC major. Even SAAMI +P is underloaded compared to CIP specs
Here is a scan of my CIP loading manual. It has SAAMI and CIP loads. Alomost every 9x19mm CIP starting load is higher than than the SAAMI max load.
There are alot of 9mm pistol designs that hate weak ammo. The 9mm case can handle alot more psi than it is loaded to by SAAMI or any of its published data. Trouble is no one is willing to share real 9mm loading data. You will just have to find what works best for you and work your way up. Try different powders. Unique is old and there are better powders these days. AA#5 should work good for what you want to do. AA#7 will leave some unburnt powder unless you use a CCI550 primer, but them loads will be too hot for unjacketed projectiles. AA#2 does not work well in guns made for higher performance that are heavy sprung.
Experiment a little and stick with a load that works for you when you find it. My pin load was a 130 made for the 38 super loaded with Viht N330. Very clean load and I got 1350fps from a 6" G17L. Knocked pins off as good as any 45 load and was a joy to shoot in my magnaported pin gun. Even worked well from the P226 on clearing pins.
Don't mix case brands and pay attention to case length and OAL. Find a load that works and stick with it.
Have fun and be SAFE.......