303 British gernade launching blanks?

[B Gardner]

I just purchased a gernade launcher for my No 1 Mk III Enfield rifle and would like to use it to launch tennis balls. does anyone have any experience loading gernade launching blanks? I'd like to know what type and how much powder you used and how you sealed the shell.

[smle-man]

I just purchased a gernade launcher for my No 1 Mk III Enfield rifle and would like to use it to launch tennis balls. does anyone have any experience loading gernade launching blanks? I'd like to know what type and how much powder you used and how you sealed the shell.

I hope you aren't in California. If you are outside of California where grenade launchers are legal I imagine a standard .303 blank will be enough to launch a tennis ball a good distance. I've got a bunch of FN .303 blanks on hand.