Need some good ideas or opinions to possibly explain weird ballistic issue with my custon built hunting rifle. I have a Rem 700 Classic in .300 Wby Mag. I recently had a #5 contour 27" lilja barrel installed. The action is pillar bedded and the barrel is free floated. I use a PE1 Shepherd riflescope. I use Barnes Triple Shocks in 180 grain. With this bullet running 3,250 f.p.s. to 3,300 f.p.s., according to my Shepherd literature, I should be hitting darn close to the center of my circles out to 1,000 meters. When I got this gun back from the gunsmith after the barrel job, I worked up a load that was running 3,250f.p.s. and shot a three shot group that measure 1/4 inch c to c. I shot at my target throughout the various distances to 1000m. I shot a pair at 1000m that were 2 and 3/4 inches apart. Bullet impact was very, very close to center of each circle, I was only about 1 m.o.a. low of center at 1,000m. After about 80 rounds or so through the new barrel, I noticed my point of impact getting lower and lower in the 700, 800, 900 and 1000 meter circles to the point of being clear out of the last two circles. I figured the gun is breaking in and the velocity may be falling off. I worked up a little bit hotter load, still accurate, but not much point of impact difference. I borrowed my friend's chronograph and fired three shots, 3,319, 3,325 and 3,329! Why am I falling out of my circles now when originally with that slower load I was right there? This makes no sense at all! The shepherd has been bullet proof, no crosshair problems or issues with things moving around so it shouldn't be the scope. I also use heavy duty Warne rings and bases, once again no movement. The only thing I could think of was barrel whip or vibration. My gunsmith says barrel whip cannot account for my point of impact being 2m.o.a. low at 800m, 3m.o.a. at 900m and 4m.o.a. low at 1000m. Any inteligent ideas or similar experiences? This does not make sense!