Found this spent rifle cartridge today, which is nothing special normally except it was found within 50m of a former military site dating from the 1850's and through to the mid 1900's.
It's a .303 british caliber, and the headstamp codes idenitfy it as
Royal Laboratory, Woolwich Arsenal, Kent, UNITED KINGDOM
Mk 6 Cartridge design, manufactured 1906-1912
Was barely under the ground, maybe 2 inches, found with X-terra 705.