Have you considered adding small pocket 308 Win. brass loaded with a ball powder to the test?
I'd be curious as to those results well. I believe I have some shot strings stored in my silver mountain system of 7 1/2s vs 450s in .308 lapua sp brass with N150 and a 155.5 bullet. The 7 1/2s were slightly faster if I remember correctly. I'll be able to check in a couple of days.
