Leon, I would loved to have a go with a Barrett although my cadet times did allow a little SLR and Lee Enfield's. Missed out on a mag from a Bren, we had run out of rounds before my chance came along.
Our cadet supplied weapons were SMLE Nr4's but my best grouping ever was with a Nr1 stamped 1918 and still with a dum dum cutter fitted. Did wonder if it have ever been used in anger.