I have had great success using Nosler 140gr BT in testing and 140gr Partitions for hunting in my wsm in 7mm using h 4831s/c using mag gold match primers. I don't think the Lost River bullets are in 140gr maybe 130gr J36 hunting Note photo of last bullet lost river it by far has the best BC 644 and shoots very very flat, never tryed yet on game.note how long and sleak the lost river is