S.P.C. supplied smokeless powders and ammunition for some of the most important small arms and ammunition producers of the period: Holland & Holland, Wm. Moore & Grey, W.W. Greener, Rigby, Kynoch, Eley Brothers Ltd, Royal Small Arms factory, Winchester Repeating Arms Company, Remington Arms Company, LLC and countless government armories with one special note with supplying the UK's Ministry of Munitions with smokeless powders for the Maxim and Gardner machine guns. Dougall recounts the testing of the Maxim gun at the Barwick range.