gunmart: Thanks for the info but as my post relates, I know what holdover is. The sighting in method I use requires a 2.5" (the diff. between point of aim and point of impact with AR's)holdover within 10 yards/ 1" low at 25 yds. And yes, I also realize that a different rifle, i.e., one with sights closer to the bore, would negate this problem. However, I'm requesting information specifically on the technique I wrote of in my post - canting the rifle so as to sight down the barrel, eliminating the sights (or finding some point of reference along the barrel to use as a rudimentary sight) and negating the holdover problem at very close range.
Again, has anyone heard of this tech. or have any experience with it?