While I don't have any direct practice with the Parker bows....I can say once the proper "arrow" is selected, point, arrow weight, get the sight / scope is sighted in, etc.....you should be able to put base ball sized groups into a target at 30 yards.

By all the arrow items noted above. If you do all of your practice with one arrow style / weight, and then you try another weight or tip design (field tipvs. broad head), your aim will be somewhat off. You will have to get used to a given arrow weight, tip design...OR get used to having two (maybe three) points of aim.

Just like a rifle, different bullet types and or weights will require a different point of aim.

Shoot, experiment, have fun with it.

Mike