It doesn't like to be compressed but it cant have an airspace.
What happens if its compressed to much? or too much open gap left between the powder and the bullets base. What happens there? Just another one of those learning experience for me Hawg. I got a jug of Triple 7 in 2FF loose I've never opened here. I didn't know if it would work for my application of it. That's why it's still sealed yet after 3-4 years since I bought it.