As far as accuracy goes my Barnett 400 shoots the regular 125 Muzzys really well even out to 50 yards. Doesn't shoot to the same point of aim as practice points but after readjusting my scope it groups the Muzzys so tight you don't want to shoot the same bulls eye with two arrows or you will be cutting fletchings.
It also shoots 100 gr spitfires very well. I like the Muzzys because they are about half price of the Spitfires and I've always had great luck with the deer I have shot with them.
My Excalibur on the other hand will NOT group the Muzzys worth a crap, must be because the Excal shoots a bit faster and shoots a shorter bolt. I'm still looking for the right combo for this bow.
So far, in two years, I have killed 11-deer with NAP Killzone with never a problem. I am sold on them for a mechanical head. However, shoot what works best for you.