Check with a good manual before using any of the following loads and consider all pressure implications. Trimming is important with the .30 Carbine cartridge to help prevent slam fires.
My personal load for my CMP '43 manuf. Inland GI carbine is: L-C '71 brass trimmed to min. setting (1.280"), Win Sm Rifle primers, 14.0 gr of Win 296, Remington 110 gr SP seated to 1.675" LOA. This load chrono's to 1904 fps for 5 shots in my carbine.
The same case/primer & bullet seating depth with 14.5 gr of IMI 4227 gives 1830 fps. Both will shoot into 3/4" groups at 35 yds.
The CMP article on accuracy from the .30 Carbine lists 15.0 gr of Win 296 as their best combination...velocity was a reported 1980 fps. In my carbines, this load is on the hot side. It is listed by Sierra with their 110 gr FMJ, as a max load with an LOA of 1.680".
Lastly, I've had improved accuracy by glass bedding the recoil plate area and playing around with the front band screw tension on three carbines. In all three, loosening that front band screw 1/2 turn from snug, cut my groups almost in half.
Best Regards, Rod