For the 6.5 and 30 cal look at purchasing some Hornady buckshot/round lead balls.
You should be able to find dia's that will suit those bore sizes.
Bob
Im interested also, but dont need 5# or 25 pounds of buckshot.
I guess Ill pull halfdozen 22 slugs and figure the best way to push em down the bore.
Im sure the 22 slugs are pushed 'dry' down a dry bore. I have a small dowel and think that will be a pusher.