Knowing what arrows you are using and where you live [CAN or US]would be a good thing. I use GT L II's w/ brass inserts and 100 gr Slicks w/ good results, but the Slicks seem to like more FOC than alum inserts have.

Danny Miller, Excal warranty rep in USA sells them, among others. They weigh about 408 gr w/ 100 gr points.

The only Firebolts I've shot belonged to others passing thru here, they had good results w/ 150 gr Boltcutters.