I was wondering if any of you guys have played around with this cartridge I just finished building one and have only had it out to our 1000yrd range but I hope to have it out to 1500yds this weekend. The action is a sako L61R I trued, the barrel is a bead blasted SS Krieger BR taper, Timney trigger and pillar bedded in a A-5 stock. I cut the chamber With a standard neck and 0 excess head space. The load I am using is a 200gr Sierra MK, Federal Gold Match mag primer and charged with 83gr of H-4831SC powder, in a Rem case. MV is 3050fps. So far accuracy is great .375 MOA @ 200yds off bags I have not shot for group any farther just 12x12 plates to 800yds. The round still pierces .375 grade50 plate @ 600yds.