I've got no chronograph yet but will come x-mas time. Im hoping to load for my 375RUM with stock 26" tube tommarow and would like to use the 350gr smk. Future plans were to sell this and get a 375 Cheytac but plans changed. Im gonna just keep the RUM and go longer custom barrel/brake down the road for more velocity. I have not seen anyone on any forum have a load for this combo. I've got 3 loading manuals and im trying to do some accurate math about a starting load. No chrono makes it hard. I gotta get one! I have RL22 and Retumbo. I've also got H4831SC but thats probobly to fast for that combo. . I'd like to get this rig going and if anyone has a tested load that is safe i'd love to hear it.