Time to continue load development with my .44-77.

[Don McDowell]

I asked them to make some modifications to the 434470 bullet I asked them make several years ago. Shortened it up a bit and put a .438 diameter .4 in long base on it. They list it in the catalog as 438470, out of 20-1 it is exactly 470, 16-1 it's 467.
As long as the base of the wad stays above the base of the case neck you should be good to go. It then becomes a matter of what seating depth does the rifle want? Generally with these bottlenecks, if you're getting excessive fouling then you don't have enough powder, other than that they're pretty forgiving and easy to get along with.