 The new weapon also used an intermediate spring as a source of energy for cycling of the bolt with a stationary barrel, simplifying design and making it potentially more accurate and reliable.The design was refined and then tested by British Army on several occasions.This rifle was initially chambered for the new ".303 rimless" round, designed by necking up the 7.65x53mm Belgian Mauser case and loading it with British-issue Mk.VII bullet of .303 caliber.