The simple answer now as it was back when is to "NOT" use finne ball powder with these primers. Back in the day I shot quite a few of the Rem #57 primers using Hercules flake powder without a hint of a problem.
Tom is 100% correct, that warning was widely publicized back when the fine grained ball shotgun propellants were brought on the market.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra