Pushrod diameter question

""Is anyone using the 5/16" (heavy wall, Manton Grade 3 or Manton Grade 5) pushrods on solid roller valve springs (220lbs/540lbs) for reference?""

I just got a reply from Manton on which size of pushrod they would recommend for a spring spec of 230lbs/540lbs, @ apx 7.850" long and 6400rpms. They recommended their 5/16" x .118" in a 5 series [275k psi], or the 11/32" x .120" in the same series would deflect 53% less under the same load.