I have a STW a guy built for me 26" Shilen Mpi Stock etc. I am pretty new to loading and after some help from folks here got 72.5 gr of H4831 to shoot 140 accubonds at about 3250 fps and hold under .5". Was happy until it blew up on a whitetail running away from me at 150 yards. The bullet hit the left hind quarter and never even reached or broke the bone. Since then tried the TSX in 140 and with the same powder 3/4" up to 75 gr of powder and 3350 fps. I now hear the bullet maybe too hard and not opening up enough. I got the gun for antelope, coues and long range mulies. I am now thinking bout using the accubonds on lopes and coues and blacktails and the tsx on mulies. Any suggestions? Maybe the mrx, berger or even an A-Frame. The gun does not like Nosler Part. Thanks