Happy new year castboolit friends. This cold weather has me doing some casting and wanting to try new loads. I've got some trail boss and have wanting to try this in my 1885 winny hi wall. The boolit of choice will be a 385 grain cup point from my NOE mold.
From what I've read, I have two options. Stick to the IMR load data or I can also use a method that was published by IMR some time back.
The method is mark your case to the level of the boolit you're using, fill with trail boss and use this for the max load. They also recommend starting at 70% of this.
Has anyone here ever done this? Over on the Marlin site, someone loaded up to 15 grains for 1200fps in their Marlin lever gun. I'm sure with the strength of my hi wall I'll be fine starting at 16. But, I'd rather obtain more data first.
Thanks for all the help.