In terms of grains/inch, what is the lightest arrow that I can shoot with a #73 draw weight and 30" draw length. Those details are very important, because if the arrow is not strong enough it will break. Who knew?

http://www.highcountryarchery.com/arrows.htm

I THINK THESE MIGHT JUST HAVE IT..

5 GRAINS PER INCH...ON BOWTECHS

I like the fact that they are 5gpi, but are they strong enough for my set up? I want to use them with 125gr screw-in Magnus Snuffer broadheads and 4" feathers. Is that going to fly?

Rule of thumb is usually 5gr per lb of draw wgt,not 5gr/inch. A 73# bow will need about a 365gr arrow

Is that absolutely true (even with super high grade carbon)? My draw length is 30" and I shoot a 31" shaft. Those 5.5 gpi arrows would give me a total arrow weight of 305.5 grains. Sounds great! If I need a 365 grain arrow, could I increase the size of my broadhead from 125 grains to 170 or 185 grains?

If you go with that light of an arrow it will probably not work with that heavy of a tip. You may want to try 75gr. or lighter. Im shooting 70lbs 300gr total weight arrow with a 65 gr.tip! Look at the Easton Lightspeeds thats what I am shooting the 500 spine and all the guys at my shop are shooting the same with there airbournes!

That has got to be some fast shooting!

Im shooting 310fps out of my General...I think they are getting like 340fps out of the 82nd's like this!

They are telling me on the other forum that less than 365 grain arrows would void my warranty. Not good! So I asked if I could put a 185 grain broadhead on instead of a 125, which would bring my total arrow weight from 305.5 grains to 365.5 grains. Sounds perfect, right? No! They told me that would be too much FOC. I have no idea what FOC means. What does FOC mean?