In my Accu Shadow ran MG 124 jhps at 1.080-1.100 with no problems. I did get a reamer and reamed the throat of my Accu Shadow, CZ85C, Pro-Tek II, Rami, Son's SP01 Shadow, Rami & CZ75 Shadow T. They were all reamed to the same depth, about +.040-.050. We can now load MG 124 jhps to 1.145 if we want. We usually load to an OAL of 1.120. I tested my Accu Shadow on a Ransom rest for accuracy before and after the barrel was reamed. I found no difference in group size.