I have 2 current favorites
1) 150 grain Hornady FMJBT, pushed by 47.0 grains IMR 4895, overall length
3.290", MV 2,550 fps
2) 145 grain M25 Tracer, pushed by 47.5 grains IMR 4895, overall length
3.290", MV 2,565 fps
at a recent match the Tracer loads were accurate enough to hit a 1 gallon milk jug at 435 meters with iron sights and provided enough juice to knock down steel reactive plates weighing about 50 lbs at 300 meters.