As the OP mentions going out to 500-600yds at times, I’d certainly lean on a 1/8” twist. While a 75gr bullet at 2900fps is not blistering fast, it’s made up a lot of ground against a good 50gr offering by the time you reach 300yds and it excels past that range. The trajectory of a 75 at that velocity also mimics that of many standard big game rounds. Handy for practice.
