Thanks TAB, good stuff, I learned this way and it is as sound today as it was then, a few improvements on sitting and prone technique, but the whole premise of good shooting position, is bone, versus muscle.
I shot U.S. service rifle for many years and love it, my eyeglass prescription, still allows me to see the iron sights on my M1a, ok on the AR as well, but perfect with the longer barrel.
If you truly want to be an accurate shot with rifle or pistol, it starts with the fundamentals sure, but the record book is the most important, logging your load, sight settings, sling position, conditions on the range ( wind direction, wind speed, sun position, altitude, humidity etc..) is where real shooting begins, when you go to a new place, you look up your record for that kind of condition and plug that into your rifle for shot #1 and your probably there, takes a while to build your book but it's worth it. You may not think a pistol book is worth the effort, but it is. By keeping a record book you can see trends in your shooting. I'm doing well, but my mean group is always low left, well after several strings, you can adjust your sights to compensate. Snipers keep record books, guess why.
One quick tip, I used to shoot NRA action shooting, it is no longer active in my area, I am master rated. I sighted my pistol for the top of the X ring, about 2" high, why, because a good shooter if he or she misses, will usually shoot low due to flinch or trigger jerk, by sighting in high, instead of an 8, I may clip the bottom of the 10 ring. A single 8 at the Bianchi cup, will put you in the top 20 maybe, but not the top 10 usually.
Anybody else recognize the DI's voice, it's been around for 50 years?