Vihtavuori N170 is the slowest burning rifle powder in the N100 series (not taking 20N29 and 24N41 into account) and in fact one of the slowest canister-grade powders readily available from any manufacturer on the market. As with all of our rifle powders, N170 grains are of the cylindrical, single-perforated extruded type. With a length of 1,7 mm and a diameter of 1,1 mm, the grain size is relatively large. As a very slow burning powder, N170 is a top choice for very large capacity cases such as the .300 Weatherby Mag. and .300 Remington Ultra Mag. and also offers good performance in most of the belted Magnum cartridges. The N170 powder is used by reloaders in shooting disciplines such as long-range big-game hunting and target shooting.