Have been shooting a 158 grain semi wadcutter and a LBT 180 grain WFN design in my 6" GP100 for a couple years. the accuracy seemed OK. Then last week a friend gave me a couple hundred 168 grain Keith 358429 bullets. I loaded then up with 13.5 grains 2400. They seem to group unbelievably well at 250 yards! Much better then the others I 've been using. So think I will order a mould for this bullet, or the 173 grain. Has anyone had experience with this caliber enough to know best bullet weight, design, and mould maker? I will be using it for hunting. Thanks in advance.