I shot a few of the Surplusrifle postal matches. Kinda miss those Allieds vs Axis matches. That's what got me started collecting surplus rifles from other countries.
Revere's Riders classes teaches how to correctly use a sling in 3 positions, on the clock, with a mag swap. Army "AQT" style. You'll learn how to stack 10 out of 10 shots into a 1" circle at 25 then try the same techniques at full distance (400 yds).