The slowest burning member of the N500 line, N570 is the perfect choice for those tasks requiring heavy bullets and the largest capacity cases. Its burn rate is very close to that of our N170, but will generally provide a bit more velocity in the same cartridges, and using the same bullet weights. The burn-rate characteristics of N570 allow it to deliver the very best possible performance from such cartridges as the 6.5x284 Winchester, 300 Remington Ultra Mag, and 338 Lapua Magnum.
Big Book Catalog, Issue:68, Page:544
Sinclair, Issue:5B, Page:094