Late May I shot in a PRS long range varmint steel silhouette match ,cool temps and gusty winds . I won the match really surprised me ! Today I moved up a classification ,shot out to 665 yards . It was a 100 degrees in Nevada desert, Smokey inconsistent winds and mirage everywhere . I shot very poorly ,6mmCreedmoor 110 Hornady A-tips. in front of 40grs of H4350 . No pressure signs ( Other shooters were blowing primers) Scope is Delta Stryker . I was thinking of a MDT ESS new chassis maybe a Scope Upgrade ,(guy out there had a ZC and it cut through all the haze). But now I almost feel embarrassed . Anyhow, any books are videos out there that can educate me