N540 is a mid-range powder in the N500 series, and an excellent choice for cartridges running from the .23/5.56mm, 308 Winchester and 30-06 Springfield with appropriate bullet weights. This is also a great powder for 6.5x47mm Lapua and 6.5 Creedmoor as well as the 223 Remington when using heavy bullets from 69 to 82 grains. It is exceptionally clean-burning and delivers outstanding accuracy.
Big Book Catalog, Issue:68, Page:544
Sinclair, Issue:5B, Page:094