You're gonna LOVE that gun, BP. I've had and shot the devil out of almost every type 38/357 on the market since I just love um all. First of all, there ain't no bad loads. Just open your loading manual and dive in.

Best powders for the hotter stuff are 2400 and Blue Dot. I accidentally discovered that Herco makes a dandy powder in 38 stuff.

I tend to load pretty hot 38 ammo with heavy bullets and my .357 loads I like to load 110/125 gr bullets. But I throttle back just a bit on the .357 ammo because .357 brass doesn't have great life if you push it. Also no since shaking the gun apart just trying to get a few extra fps.

Also know that you can get a pretty wide point of impact spread when you load fast light bullets compared to heavy bullets. The hot heavy stuff will impact a lot higher due to recoil.

Have fun!