Happy Pappy I have a few questions and a couple of suggestions or statements.

First of all, at 20 yards your arrows should be well within 1 inch of each other, this is why it is said to only shoot one arrow at a time at a target. Doing otherwise you risk shooting one arrow inside another that is how accurate these baws normally are.

Now my question is, how are you loading or cocking the bow. ARe you using a rope cocker or are you doing it by hand. The reason I ask this is that if you cock the string improperly (a little off center) will hurt your accuracy or groups. What I advise new shooters is to mark the string (while it is uncocked), even with the sides of the rail (white out works good for this) and then when it is cocked, you can tell if it is loaded off center (your marks no longer centered with the rail). This is actually the most common cause for large grooups with the accuracy.

Other possible solutions for you could be that your arrow is not sitting back tightly against the string before shooting, your point or head is not tight to the arrow. You did not tells us if your grouping problem was with heads or field points. I know my father had grouping problems with 125 thunder heads in windy days.

Let us know if this helps or give us more info so we might be able to figure it out for you.