Got bolt action 223 with 16.25 in barrel with 9 twist I’ve been Varmint and steel shooting to 300yds, now I’m shooting 55grn Sierra hpbt over Ramshot exterminator and shoots very good. I’d like to start working on extending my shooting skills further (with all my rifles) but figure the 223 is a good gun to start with. I know the short barrel is probably going to limit me some, which leads to the question of what kind of distance is this gun reasonably capable of? And question 2 would be any suggestions on a better bullet n powder that may work better? Heavier bullet?