Do any of you have personal experience relating the use and performance of Vihta Vuori Oy powders in the big overbore cases ? I'm talking about the .378 Weatherby Magnum, .404 Jeffery, and .416 Rigby-based cartridges, both factory and wildcats. The loads I currently use in my .30 Cody Express (.30-416 Rigby Ackley Improved (40-degree shoulder)) are based around Hodgdon's H870, but I was curious as to how the VV powders--N170, 20N29, and 24N42 in particular--compared with the Hodgdon powders (H870, H1000, H50BMG), as well as comparable powders by other manufacturers. Mostly, I'm curious about safe pressures, accuracy and velocity, but ease of cleaning is also important. I understand that every rifle is different, so I don't expect any loading data, unless someone cares to recommend a good starting load for the .30-416 Imp. using a moly-coated 200-grain SMK, in a 36" long, 1-in-9" to 1-in-9.5" (RHT) barrel. (The rifle was purchased secondhand, from the original owner--the action is a modified Remington 721 Magnum action (SAKO extractor); the barrel is a 36" K&P Stainless Steel, 1.25 inches in diameter, and unfluted. The twist rate was ESTIMATED using a cleaning rod and a lightly-oiled patch.) Thanks again.