most rifles... there is little difference in POI from a clean to a dirty bore. Although I do have a Knight LK that will throw the first shot up to 2 inches out. So I do foul that bore. I then clean the rifles at the end of the say.

Depending on the weather, humidity, and environmental factors, with Triple Seven when I tested it on barrel steel it went three days before it showed any sign of even starting to rust. But again that was sitting inside my house on a shelf where I could watch it.

Try the rifles on a clean bore. Swab the barrel with an alcohol patch then a dry patch. Then pop three primers through it. Load it and see where it hits in relation to the second shot. They should be real close.