Do the Hogan lowers have undersized pins?
I'm tooled to do .250" pin holes for part of the process I use when I'm fitting uppers to lowers.
Are you looking to do a matched upper and lower combination, or make your lower 'universal'?
The process I use to mate uppers and lowers results in the upper becoming specific to a single lower.
As
@longshot2000 mentioned, there's a lot of variation in the large-frame world. I can only imagine it increases as we start finding things in the back of the safe.