I bought a couple of Wby Vanguards(223Rem&257Wby) and was pretty disappointed in their test targets. While they were under the guaranteed spread, it wasn't by much. I've cut those groups by 1/2 or more so now I'm semi-satisfied. I think it's more a selling/advertising point than an actual performance guarantee since most production rifles these days will do MOA with some flavor of factory load on a good day.