I finally got around to slugging my barrel on my 1972 Marlin 336. If I did it right, I got .310”.
I haven’t loaded any cast for it before because I was unsure about what diameter to use, but now that I know the groove diameter, I ordered some 165 gr .311” coated #4 Whitetail Hi-Tek.
Now I’m searching for a good powder to use. I’d like to use something I’ve already got, but can’t find much load data for this size bullet and any of my current powders. I’ve got some 2400 and Unique, but I’m running low on both. Has anyone had good results with IMR-4227 or H110 for bullets like these? I’ve also got H4895, but I haven’t found cast data for it at all. I could use some recommendations. I’d like to stay around 1500 FPS or less.