I tested the 168gr tsx's today in both of my 300ultramags.Conditions were horrible with rain and gusting wind and my results were mixed.One rifle averaged no better than 1-1/2" but the other averaged around 3/4" to 7/8".Given the poor conditions the groups could have been slightly better but it appears that this bullet shows promise in one rifle but not in the other.However,I am going to test the 180gr tsx's in both rifles before deciding if I want to pursue any more load development with the 168's.On a side note,I did shoot a couple of the 168gr tsx's into a 1/2" steel plate 100 yards away and they both completely penetrated the plate.Given this,I doubt that any moose or elk shoulder blade will stop them.