The only similarity (pressure aside) is the .375Win using 250g @1900fps and the .375 2 1/2" using 270g @ 1975fps this is as close as the .375Win can get (factory loads)I would think. There is always some write ups wanting to compare American lever action cartridges to British Double/Single cartridges the latest one is the .405Win to the .450/.400-3" .