hmm refure to shooting threw pipe theory: looking threw 1 inch pipe, deer at 3 yards, can count the hairs, at 30 yrds, can count the horns, at 300 yds no limit's ta what ya can count.. could be the scope got bumped

The real problem here is nobody taught the difference between call of duty shooting and real shooting. In call of duty there is no bullet drop. Go to a long range and practice long shots. that's the best way to be proficient at a distance. You might be dead on accurate at 100 yards but like someone said earlier, every little mistake is hugely amplified at that distance.

The 30-06 I have is sighted in with 150 grain corlokts 1.5" high at 100 yards. Puts me dead on at 200 yards and 8" low at 300 yards.

Haven't shot the 180 Grain, but there's less than 0.5" difference between 150 and 165 grain.

With 100 yard zero you're looking at over a foot of drop at 300 yards. You can sight it in at 50 yards and you'd be better off. 50 yard zero would also put you 1/2" high at 100 and dead on at 150. This is from ballistic calculators and from what I've seen they're usually within a 0.5" or so out to 200 yards and within 2" at 300 yards.

You do not need to compensate for up/down hill shooting until the angle is greater than about 15 degrees. Even then, the difference is not that much until you get to 30 and 45 degrees or more. Whether it's up hill or down hill, you begin to hit "high" on your target because gravity has less distance to pull the bullet down.

In this case, it sounds like the bullet went under the deer because of normal bullet drop. A 150 to 180 grain bullet will drop about 12" to 18", depending on the speed and bullet weight.

Navasota is right..If your rifle is zero'd 2 in high at 100 yds,
and you put it on hair...mostly at the top of his shoulders at
300, it should hit..but before you do that..I'd suggest you get a
5 to 55 gal drum or bucket..set it up where you missed..and get
a good rest and just see if you can hit the target..We have a 300
measured uphill range at the ranch w/a large target painted on a
55 gal. drum..a mech. rest on the bench..and we have had a number
of so called local Rifle Shots/Hunters try to just hit the drum..
Most hunters are doing well to go between 100 and 200 yds...after
that is where the work begins...Practice..and a good trigger helps....Good Luck...Don Dial