I got my first firearm about 2 months ago. Its a R700 Varmint riffle to which I added a Vortex Viper 6.5-20 x 50 scope. It shoots sooo nice! I am mainly interrested in long range target shooting. I've been working my way up to shooting accurately at longer ranges, but so far I'm shooting 400 yards or less. I am using Federal Premium 308win Sierra Matchking ammo. It seems to be very good and consistent, but looking at the trajectory charts, it quickly drops out at 500 yards. I heard that my riffle is accurate enough to do long range shooting but the ammo charts seem to say that after 500-600 yards the bullet runs out of juice. Am Imisreading it and if not, what is a recommended ammo for target shooting in the 700-1000 yard range???