I have used the 45 gr flat nose load data hornady publishes. I never do max loads. I think i did 11 gr of lil gun. Good accuracy.
11.0 grains of Lil'Gun is below the minimum charge in my Hodgdon manual. It might be safe but those cases are so small I think a full grain of powder might make a big difference.
The minimum charge I show for a 45 grain bullet is 12.0. Max load is 13.0 grains.