CBM...Have you had the trigger adjusted?? If not, have a gunsmith take it down to 2 1/2 -3 pounds..

Also...with my gun, I shoot two shot groups, then let it cool, the 3rd shot will be high almost every time...

This all being said, the more you practice, the better you will get...I find that most guys really don't need to be shooting in a hunting situation much past 150 yards...

Once you get the gun sighted in, get off the bench, use a bipod, rest, whatever you will use in your deer stand and shoot that way...After all, it's more important how you shoot from a field position than from a bench...

One thing I like to do is put up a blank 8 1/2 x 11 piece of paper, set it up horizontal (this is about the size of the lungs on a deer) and shoot at that, this lets you know if all your shots are in the kill zone...

Look at it this way...How long did it take you with a bow to keep all your arrows inside 3-4 inches at 30 yards???

Trust me, 300 yards in the field is a long shot, especially down South, most of our deer are not too far from a cutover or a swamp...When you get that opportunity, you need to be absolutely positive that you can put the deer down quickly....Its not like out West, where you can see the deer run off 100 yards or so after the shot...In over 40 years of deer hunting, I have only killed a handfull of deer at 250-300 yards, and our farms in eastern NC are large, and the land flat...I love to hunt soybean fields, but most deer are still killed in the 75-175 yard range...