How can I get upto 425 grain? The Beman ICS Hunter suggest the model 400 (8.4 gr./inch). My arrow shaft is 29". that makes 243.6 grains. I think I can go only upto a 125 head. This leaves me a little shy.

Please pardon my ignorance, since I have only hunted whitetail and my 340 grain setup is really good for mefor that size game.

Thank you again for your help.