I use a 38spl case. It really dont matter, you can do it by eye after a bit of trial.
My club has banned the use of powder flasks insisting that we use phials, which I fill at home from the powder measure on my reloading press so very consistant. So I'm thinking of sorting out a suitable spout and using my flask to dispense the cous-cous.
My current load is 17gr by weight 777, 38spl of filler, no wad just aloxed ball with no other lube.
Getting 3" groups at 25m which is as good as I get with any other gun over iron sights.
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane