From what i was told by a good gunsmith the .243win was developed for varmint hunting really so alot of the heavy bullets wont work. I know of three or four sako's and tikkas that will only shoot light grain bullets. As for the sauer 202 benched and viced at the factory they usually get 15mm 3 shot groups, each rifle does come with a test target but on the ammunition side Sauer load there own. Hope this helps.