After a few events , we have now settled on what blanks are permitted at Eversley
1. .22 short and .22 Long
2. Plug fire caps, including double cap cartridges
3. Percussion caps for Black Powder models
4. Shotgun Primers
4. For 9mm rimmed, ONLY Fiocchi rimmed .380 (9mm) blanks. the box looks like this:
Any other type or make of blanks including other brand rimmed 9mm, 8mm or 9mm auto blanks, .38spl, .38 S+W, home loads, nail gun cartridges. If you have any of these, they can be used as long as you remove any powder and wads so they are only firing the primer.
The Fiocchi Rimmed .380 (9mm) blanks are readily available but some suppliers will not post and, where they will, they often charge heavily for postage. Zero one often have good supplies and cheap shipping (they actually come boxed as above):