I shoot sling/pone at both 600-1,000 yds. I run a 8 twist Brux bbl. light Palma @ 30". At higher elevations I like the 110 SMK. @ 3,050 fps Elevation below 500 ft ASL, I switch to the 105 Berger hybrid @ 3,130 fps. BBL life is between 1400-1,800 accurate rds.The basics - competition and steel max distances; bullet(s); barrel length / MV; approximate level of precision you get; barrel life (if known).
Lloyd