Re: Broadhead weight
I second what 'dpms' says. I use arrows with brass inserts so that I can just stick with the 100 grain heads and still have the proper front of center weight. The most important accuracy factor for a crossbow is getting the weight toward the front of those short arrows, so if you go with aluminum inserts, 125 would be ideal.
"I became insane, with long intervals of horrible sanity"
-Edgar Allan Poe