Sunray:
What I am looking for is a clean load that makes milspec velocity of 1800-2000 fps with a 110gr jacketed bullet and is not temperature sensitive. Many ball powders are temp sensitive. Because of the M1 gas system I want minimum fouling in the gas piston.
So far, I think Vitavouhri 110 may be the best with Hodgen 110 a close second: Winchester 296 has been also recommended. I plan to use CCI Milspec 41 primers to prevent slamfires. These are mag primers that are less sensitive than CCi 450.
It looks like Winchester 296 might be a candidate. Even though the ballistics look good, I have heard 2400 is a bit dirty and the gas system on the M1 carbine is not designed to be cleaned regularly.
Being an engineer, I am a stickler for trying to adhere to the designer's requirements for power etc.
By the way: I just shot a 10rd group off the bench with a CMP carbine using irons at 25yds that was under 3/4" and my eyes are not that good anymore. Ammo was Federal American Egale 110gr FMJ.
I am very impressed with this little rifle.