What grain to use in long range target shooting

[El suave]

What is the better grain bullet for long range target shooting with a AR15 24' ss barrel 1:8 twist

 

[JohnKSa]

Assuming you're talking about .223/5.56, then, according to Berger bullets, a 1:8 twist barrel will limit you to conventional (copper-jacketed lead) bullets weighing 82 grains or less.

If you go to monometal (solid copper or gilding metal) bullets, you will be limited to even lighter bullets.

 

[NWPilgrim]

The heavier the bullet (assuming equally streamlined design) the less wind drift. Should be able to shoot the Sierra 77 gr match king BTHP with 1:8 twist. If you go up to 80 gr you may have to seat longer than magazine allows and single load by hand.

 

[4EVERM-14]

On a day with light wind a 75 Hornady or 77Sierra will work . 80 grainers can handle wind better but,as NWPilgrim posted, longer then standard OAL necessitates single loading.