Re: long range .223 anyone?
Certainly people shoot long range with a .223. It is a good little round to learn all the fundamentals of long range shooting at a very reasonable price to shoot. It will teach you about wind drift (BIG TIME) as well as all the other aspects, ranging, dialing, judging wind, temperature effects on the velocity and POI.
Long range is a term that applies to the outer limits of any cartridge. Long range for a .223 could be around 600-700 and maybe a little furthur but to a .30-338/378 long range might mean 1300 to 1500+.
I would say that 800 is possibly doable but you have to watch the supersonic/subsonic barrier. Bullets loose stability VERY rapidly after they go subsonic (about 1100fps I think).
I would suggest he uses the highest BC bullet that he can stabilize with the twist that he has. Maybe try the 105gr Amax. I have heard good things about this bullet and it should have the weight/BC to go the distance if he can stabilize it.
Good luck and burn lots of powder!
I shoot 1/4 inch groups at a 1000 yards. That is...till my second shot.