Well in your last post you stated that you had the parallax adjusted correctly with the 50 and the 100 yard shots and from what you are saying, they shot well. Now on the 200 yd shots, you say that you had the parallax adjusted to infinity which in my opinion is not the adjustment setting that you want. You want the adjustment for 200 yds. And on the 300 yard shots, you didn't adjust the parallax at all and it shot poorly so you need to adjust the parallax for 300 yds on that one. I am just going off what I am reading.
And for goodness sake! You are not shooting out to 1000 yds so take it off of 24 power! Try a lower power on the scope and that might help as well as adjusting the parallax.
If nothing else that you are trying works, then try switching out scopes to see if that is the problem.
The other thing. If I wasn't adjusting my parellax correctly, shouldn't I have at least had consistant groups whether they were high, low, left or right, shouldn't have have been together? I understand what your saying. My shots would possible not be where they should have been, but as long as I didn't adjust the parellax between those 3 shots, I would think they should at least be tight groups. Thanks for the help again.