I was brought up around guns and shooting from early childhood, and have fired a wide variety of arms, from a .22 rifle, through a range of calibres to a .5 inch elephant gun and an 8 bore shotgun (fun - packs a punch!!) That would include various machine guns...bren gun, sten gun & GPMG (ok ok = General Purpose Machine Gun...)
A fairly decent result; so if you're interested in one of my daughters, have a care would you... (update: too late they're both married...)
.22/22 Hornet/.222/243/7x57mm/500 Nitro Express/12 bore/8 bore
Errrrmm....pound coin...
Cartridge cases from some of the guns I have fired over the years...