funny part is he tinkered with crossbow for 15 years, i have owned mine for two year and i for a fact know there limits, more over the compound bows.if he canonly meke a fist size group at 150 he needs to get some real arrows instead of game getters, and use a rest to get steady, most crossbow will shot a lot better than that. mine shoots 1/4" group at 20 yards. i have not shot it at 150 yard as i don't have a scope that will let me shoot that far. maybe it is time to buy a hha OPTIMIZER. THEN I CAN ACURATELY CONNECT AT THAT DISTANCE.normally i won't shoot an arrow in the woods past 40 yards out of respect for the deer that you might hit a limb a deflecting the arrow and wounding the deer. same as for compounds can happen.