I also have three bolts for the Horton EXP I am using. The bolts are 20" long 2219's. This makes the tip of the broadhead even with the front end of the stirrip. Remember as I ask, I am just learning at this but isn't that a bit long? And possibly a smaller diamater shaft? Shouldn't the base of the broadhead sit between the limbs tucked in as close to the body of the X-bow as you can and still have clearance? I hunted with vertical compound bows for years, (it's been awhile) and still have several 2219 shafts, fletchings and tips I can use to make bolts with if this is the right size for the EXP but it seems to me they would fly flatter, faster and possibly be a bit more accurate if they were about 3 or 4 inches shorter and with a bit smaller diameter. Seems to me any knock down power that may be lost because the bolts would be a bit lighter would be off set by a bit better penetration. If I am wrong in my way of thinking please let me know. I don't want to begin my X-bow learning process by starting out going in the wrong direction.