Hello everyone! I am fairly new to reloading, especially compared to a lot of you veterans, and I need some advice. I have been reloading for a couple of years, and I have continually been stumped by a Henry H024 38-55. I slugged the Henry bore and found it to be exactly at SAAMI specs.
As I'm sure a lot of you are aware, the 38-55 is pretty illusive when it comes to finding load data. I have been sticking with a load that I found written by my uncle who used to hand load a lot. It's a hard cast 255 grain flat nose (acme) .378, Starline Brass case and CCI large rifle primers with 28 grains of IMR3031.
Now, it shoots, but not well. It won't group and velocities are around 900 feet per second. I have tried 26.5 grains of powder up to 30. There is no difference in accuracy and velocity doesn't change more than 50 or 100 fps.
Is 3031 too slow for this application? Should I size up the cast bullet to .379 to fill the grooves completely?
Thanks for any input.