Bill...
[I checked out the gallery at William Plunkett Photography. Holy crap, you're good!!! We could learn a lot about color and composition in that gallery. I bet it takes tremendous patience. You might attribute to luck, but patience and experience tend to 'make your luck' for you. Good work.]
Good powders for 40 S&W tend to center around AA #5 and HS-6. Since the cartridge was originally designed for higher pressures, many guns don't seem to respond to softie softie powderpuff loads. But also doesn't require max load to shoot straight. Mid range works for most of us.
Each pistol is different, but my G22, G27, and Beretta 96 don't seem to like powders at the fast end. It may be worth a try for your G23. Keep open minded to any powder between Bullseye and Blue Dot on the burn rate chart. That's a lot to choose from. Mine work best around the Power Pistol zone.
My guns like 155 to 170 grain. Competitors often choose 180 because they can get the recoil right for quick second shots. It works. For your target and practice you can use any weight or profile. Just make sure it fits the magazine when you select your OAL. See OAL note at the end below.
Glock still warns against lead bullets in their polygonal barrels (they say excessive lead fouling can occur, but not always). Many of us don't find it a problem but you might as well heed the warning and stick with plated and jacketed.
Standard primers work. Magnum primers can scatter the data when employed on mid-range loads, but if your powder is particularly hard to ignite you might try magnum primers. Just don't be surprised if you find no advantage.
If nothing else: Any jacketed 150 or 155 grain bullet (round nose or flat point or hollow point), and work up to mid-range in that bullet manufacturer's data for AA5 or HS6 or True Blue or Unique. That gives you 4 powder companies to choose from and lots of bullet choices. Just be sure to heed the OAL in that data, it's always OK to load longer. 40s&w has a funny habit of increasing pressure dramatically when the OAL is shorter than the data lists. Just load longer than the data and you'll be fine. I was working with QuickLoad once, a 1/10 inch bullet setback sent pressure close to the 60,000 psi range, wow. Not sure what would happen in real life, but it's a fair warning to all of us.
Your cowboy loads use a roll crimp, 40S&W uses a taper crimp. Typically, all semi auto pistol use a taper crimp when the cartridge headspaces on the case mouth. How much crimp on your 40? Measure a factory round and do that. If you don't have a factory round at home, I've even taken a caliper to the store and measured a round out of a factory box then put it back. No harm no foul.