The first club match after I attended an Appleseed clinic, I had an opportunity to put what I had learned to good use. Sighting, breathing control, sling position, natural point of aim.... as much as I could remember and as much as would come naturally after some practice.
The target above is my slow fire prone. Fired on a 100 yard range, with a reduced size target duplicating a 600 yard National Match. All shots scored, and all but one were in the black. Almost all hit within a four inch group inside the six inch bull.
I was shooting a 1930's Turkish Mauser bolt action with original turn of the century Mauser sights, and 1950's Yugoslavian 8x57mm ammunition that was running 10% duds (Surprisingly, as I have shot cases of the stuff with few issues).
I simply applied what I learned at Appleseed. It works.