I’ve been reloading 30 carbine for over 20 years. My first load was 15.5 gr IMR4227 with small rifle primers. This drove 110 gr bullets about 1900 fps. After a few years I found a new load on the CMP website. The auther of the article gave a little history on the development of 30 carbine ammo. It seems there was a concern of erosion of the barrelso Winchester came up with two new components. The first was non corrosive primers. The second was a new smokeless powder W296. He suggested following the original koad of 15.0 gr of W295 using either small rifle primers or small rifle magnum primers. This powder requires a heavy taper crimp to insure full powder ignition. I have been using this load for many years. This load pushes a 110 gr bullet about 1950 fps.
Harold Mendelson