I opened up my cylinder throats to .309 and I size cast .313 bullets meant for 32mag guns down to .309. There is a wide variety of cast bullets there weighing between 90 and 120 grains.
When they fit right it seems all loads work well. I am usually happy with loads doing about 1100 to1200 FPS.
BUT,,,,, I have found if I download too much, I get stickier extraction. It seems contrary to logic, but I believe low pressure does not swell the thick brass in a 30 carb. case to seal in the chamber. Then carbon leaks and fouls the chambers making it stickey.
2400 and 4227 are powders that works well for me.