Howdy Fellow 50 shooter, yeah, Woodleigh do a 570gn RNSP, I have had good accuracy in the BMG but drop like a brick past 500m. They are very hard, passing almost through a donkey @ 350m, they stop camels in their tracks though! Straight through goats @ 350-400m!
Speer do a FMJ 650gn, also try...