I use 3555 gold tips cut to 29 inches with a 45# bow. Something I noticed when I put 200 grains up front, total weight is 443 and trajectory is nice out to 25 yards. When I put 250 grains up front, total weight of 493, trajectory changes alot. I don't like shooting that out to 25 yards but it's no problem out to 20 yards. I see a big penetration advantage with the 100 grain inserts and staying away from the 25 yard line. Must be nice FOC because I have other arrows that weigh in at 517 that have a flatter trajectory.