So I have an all original 7.7 aristaka and a 6.5x55 mauser. I like to shoot them but was trying to figure out how to minimize barrel wear. So what is the best combination to protect these old rifles, single base extruded powders pushing lead bullets at middle of the road velocity??? Any recommended powders that are easy on these war relics but still decent. I do shoot them at steel in the military bolt class.