If you're shooting that 7.62x54R through an SVT38 or 40, you need to clean the gas system and anything the gas gets on as well as the bore. That's the beauty of hot water. You don't really need the soap but it makes some people feel better and may loosen up some of the carbon as well. I strip down my semi autos after shooting corrosive and just soak them in a tub of hot water for half an hour. Then, brush and oil inside and out. If you're doing more than one rifle at a time, take care to separate the parts.