took me awhile to go to carbon but I love them. I've only shot rhinos and axis although I hate the price I love the performance. I use a 100 grain insert and a trick I did when I got my first carbons where to leave them full length, get a few pieces of clear plastic wrap. Place the wrap over the end of your shaft and then push the insert in. Since your only tuning the wrap will keep the insert tight enough to shoot for awhile and will allow you to pull the insert and cut the shaft until you get the right length and you can glue the insert in. Just food for thought.