Remington's 1955 answer to the .243 and by most honest accounts the slightly better cartridge that lost the marketing war anyway. Same idea and same dual purpose brilliance but the .243 got the momentum and the 6mm Remington spent the next seventy years as the connoisseur's quiet alternative. History rewards the well promoted not always the deserving.
Loads run 80 to 100 grain in hunting and varmint offerings. A niche caliber overshadowed by its rival and priced accordingly in small boxes. The faithful who know better stock up whenever it appears.