Here is the 360-grain bullet chrono data.
Three crimps, two seating depths, and one powder charge. This, I think, is part of the reason the SD is a bit wider than I expected.
One of the spent bullets after hitting steel.
As for the groups,
270 grainers, about a 4-inch group at 55yds
280 grainers, a 4.5 inch group.
290's was a 5 inch group at 55 yds
300-grain bullets were about a 4" group.
The 360's I shot at Steel, and they all hit, so...at least an 8" group. Everything did well, it fired, and velocity was right in the realm I'd expected. They all hit the paper and steel. So, I consider it a positive outcome. I think as I get new dies and refine my process, I'll be in a position to create better and more consistent ammo.