This is a pic of my dad and my son, both shooting 50# my son used a GrimmReaper Hades & my dad a 75gr Xecutioner 1.5" expandable. They both got pass throughs, both thier arrows was 365ish grains!
I did a two part test last year called "proving the RanchFairy wrong" used my 65# bow and my dads 50# bow. My dads 50# bow 28.75" draw w/ a 350gr arrow arrow shot 282fps but shot 223fps with a 552gr arrow! That is a 59fps which is unacceptable!
I would suggest not using a 125gr head, you loose 8fps only gaining .28lb of k.e. I
would suggest using GT HunterXT 500's w/ the 50gr insert, three Max Stealth vanes, Halo lighted nock, 100gr broadhead. But if you want to go a little stiffer on the arrow i would go to the GT VelocityXT 400 because you'll get the slightly stiffer arrow but not go up in weight.