Swampman
Old Fart
Vihtavuori 500 series rifle powders are an extruded stick powder, but they're also double base.Extruded stick powders are nitrocellulose and are more stable, even though both are degrading as they age. Generally they burn cooler and more cleanly. Vihtavuori makes only extruded powders and are considered the cleanest around.
"Vihtavuori N500 series powders are special high energy rifle propellants enhanced with nitroglycerin for extra ballistic performance"
https://www.vihtavuori.com/powders/...e,from both nitrocellulose and nitroglycerine.