I am working on loads for a Rem 700 PSS in 300 RUM with a 26" 1/10 twist compensated barrel, in a McMillan A-5, with a Leopold Mark 4 6.5-20x50mm LR/T M1 Scope. I am testing using factory once fired Remington Brass, Hornady 208 A-Max projectiles, Winchester LRM Primers, Retumbo Powder. I was...