I have been trying to develop a load with hornady’s 68 gr bthp with imr 8208 xbr. The more powder I added, the better it would group. However, the groups weren’t very impressive until I accidentally overloaded 5 rounds about a have a grain more than the maximum amount. Is it possible that if I used a powder that puts more speed on the bullet, such as cfe223, that it would group better than before? Or would the new powder change the harmonics of the rifle completely?