Loaded up some lapua brass w/ some various charge weights of the MR-2000 powder and 178bthp. Shot like junk. We've had no good loads out of this lapua brass and are scratching our heads as to why. Our baseline rifle is SSG3k and that thing went from a 2MOA gun w/ the lapua stuff to 1/2MOA-1/4MOA w/ 45.3gr of rl15 in win brass; atomic factory 175 match stuff shot just over 1/4MOA.

Does lapua brass have to have something special done to it? Has done this with neck size and FL size and had similar behavior w/ rl15. Just weird.