I have 2 ar15's one in 5.56 and the other in 5.45 russian. Both are 16" barrels the 5.56 is fluted. Most ballistics charts i look at use 24" barrels for testing. Which one if either would you feel would reach the furthest? Im looking for a 500 yard yote killer im trying to decide if i can scope one of these and put my acog on the other for home defense or if i should acog one and sell the other for cash to buy a 24" bull barrel in one of 3 calibers 223, 5.45 or 204 ruger. Just looking for opinions and experience. Thanks yall.