Umm, Jim, I used to know several people that reloaded their own .30-06 blanks for reenactment. There are .30-06 star crimp dies out there, but they're expensive. I would recommend finding factory loads if you can find them.
also, "Use the red wad blanks or the European plastic blanks; the rose crimp blanks are grenade launcher blanks and do not make enough noise. "
We used to use .303 GL rounds in our Enfields - they were cheaper & a LOT louder than regular blanks. The real danger is that firing a GL round through a restricted bore (like a blank adapted semi-auto) could cause some catastrophic failures, like firing your blank adapter off, sending the bolt into your eye socket, etc. A GL round is loaded with more powder than a regular round, much less a blank - most of them are packed so full, you can't even hear the powder if you shake it. That's why the grenade launcher attachment for the Garand has a post that opens the gas port - to release the pressure & keep it from slamming the bolt back & damaging the rifle.
A fair warning: Star crimped & plastic or wood tipped blanks should only be used on restricted bores (blank adapted rifles). The paper wadding covers disintegrate & aren't much of threat, but a wood fragment or a sheared off piece of a star crimp can be quite dangerous (I know a fellow who got shot in the butt with a piece of brass).
Shotgun blanks - a thin card cover sealed with fingernail polish or lacquer will work (I've done this myself). Or you can buy "field poppers" or black powder blanks. Companies that specialize in shotguns & shotgun ammo/reloading will carry both.
Tell your friend to be careful & talk to some people that have done it. Blank adapting a semi-auto is a balancing act between the size of the hole in the adaptor & the powder charge. Too much powder + too much restriction = KaBOOM! No more rifle (& possibly rifleman).