Why, of all people/users would Military/Law Enforcement have brass with intentionally punched smaller flash holes?
Don't make much sense to me!
jd
edit to add: I just re-read again ..... you said "nickel cases" .... there's the reason for the smaller flash holes. I bet they use the same punch for what will be nickel plated as they use for cases that will be plain old nekkid brass.
I can go to bed now .... my work here is done