Am thinking of a Ruger .308 Target rifle as an F Class backup. Is the 10 twist in the Ruger barrel too steep for the Sierra 155 Palma which seems to prefer a 13 twist? Is the Ruger throated for heavy bullets? Will there be enough neck retention for a 155? Would it be satisfactory as a 1000 yard rifle? Burris Ruger to Weaver bases and Z-rings with .020 inserts may give enough elevation. Would appreciate hearing opinions/experience from users of the Ruger .308 Target rifle.