I am a new crossbow hunter. i have been bow hunting with compound for 10 years though and i always fletch my own arrows and i still use aluminum. i know, i know but i like them. my question is in the aluminum line what size shaft would be used to cut down into bolts at say twenty inches. i currently have 2219 bolts but want to know how far down i can go in shaft size to lighten up a bit but still be safe. sorry for being so long winded. i am shooting a horton yukon at 150 pounds and will be using 20 inch bolts with 100 gr heads. Thanks for any replies.