I have been working on finding a load for the 150gr Matrix this last week. Dropped the charge back on a new lot of retumbo and worked back up to 62.7 but pressure was too much and velocity spread was extreme. Then shot 62.5 with cci 250 lighting it and it was looking good 3051 , 3052 , 3052 , 3042 , 3154 !!!! Wtf ! One of the cases had more bullet seating resistance and I should have marked it but didn't. I shot 62.3 today without the magnetospeed on it for accuracy and got this. I used some of the ice I'm keeping the ammo on to cool the barrel between shots three and four and I don't know if that screwed the group or if it was another pressure spike. I shot two shots with RL26 for pressure and 58.5 at 3010 was slightly too hot. Just finished loading five each of retumbo 62.5 lit by cci 200 primers and 58.1 RL26 lit by ccI 200 primers. I'm going to see if the cci 200 primers help with ES and SD.