Thread: ballistic calculator's can be wrong

I have been working up loads for my Churchill .308 with a 1:12 twist (iron sights 18 inch barrel non suppressed) according to the Berger online calculator 150grn spitzer pills are marginally stable while the 150grn boat tail were better, so loaded up some cases with 150grn Winchester PowerPoints and nosler 150grn ballistic tips both loaded at book minimum and out to the range i went expecting the nosler to be the pick, but at @ 50yrds the PowerPoints grouped 2inches and the nosler were all over the place best i could get was a 4 inch grouping, Anyone else had the same experience?