Blackbeard I too bought some of the 125 grains heads, as Gander Mt had them on sale half price so i bought a 2 dozen,
I used to shoot 125's, then went to 100's a long time ago.
I shot the 125's this summer to see how they fly compared to the 100's, and out of my set up, only about an inch or less out to 40 yards!( nothing at 20 yards)
what you need to watch is your arrow with the heavier heads, some shafts just don't like heavier heads, and can fly funny!,
mostly carbons, from what i have heard. But I shoot xx78's, and the same shaft size as i always did!
just so you know!
I am sure others might know more on that than me!