Everyone wanted to know what I found.

Well how about shooter error and sunshine. Took the time to go in the am and went to a different range, the results speak for themselves.

100yds about 1in group-2inches high
200yds about 2in group- dead on
300 yds about 3-31/2 in group 4.5 inches low

Ready for the Dark Continent now!!!!

Dulcinea

Well the demons are laid to rest and all, so yeehaw!

Hornet, that which you haven't heard before is true. In the best of all worlds a bullet will leave the muzzle with an epicyclic precession. That is, a dual mode precession, one mode slow, the second fast. If you could see the bullet nose move through the cycle it would look like a rossette pattern. A series of large loops, interspaced with very small ones. The fast cycle precession damps out after 150-200 yards +/-, leaving only the slow precession which will continue to impact more or less. There is more to the tale but it is not pertinent.

Slow cycle precession is governed by gyroscopic stability, or GS. High GS will cause this precession to diminish, low or marginal GS will allow it to grow in magnitude. Keep in mind that the magnitude of this cycle is very small, being measured in fractions of a degree most of the time. The nest result of all of this is that your bullet lives in a constant state of deflection and in fact travels in a manner not unlike a corkscrew in its flight path. How much? It varies of course, but the largest amount of deviation I've heard of gives the radius of about 3/8th of an inch, and generates about 2 full cycles in 150-200 yards. Fortunately it really doesn't affect the DOW JONES averages, so keep on shootin'!

The bullet does travel a helical path "corkscrew". However the center of the helix never
lies outside the bullet.
I'm happy the guy found his problem.
Good luck!