im trying out filling allum arrows with hot glue sticks its around 15.4 gpi i boosted mine 67 grains i jost gott see what the flight differance is

Excited to hear your results

well it weakened it slighly  but well withen the acceptable rangei went from 225 grain heads to 200 and they where stiff again so i went back to 225 and left it at that i expect if i fiddled with the fletching orientation it would work just fine, they are whisper quiet though

my arrows went from 520 grains to 660 i put 2 stick in each then took a tourch and hgeated up the entire shaft so they dont move around they havnt budged yet and they hit my target like a brick out of my 72# bowill let you know further updates when i get my 90# tuned