My wife and I have owned probably 10 .270's or so, and without exception among the most accurate loads was around 57.0 grains of H4831 or H4831sc and a 150, usually either a Hornady Spire Point or Nosler Partition. In fact one of the most accurate big game rifles I've ever owned was a Remington 700 ADL purchased in 1972, back when they had impressed checkering in a really shiny stock. But it would group 3 of the Hornadys into an inch--at 300 yards.
Muzzle velocity in various rifles has run from 2800 to 2950 or so, depending on barrel length and bullet.
