maby you will listen to Laurie,,,,he is saying what happens in the real world,,,,I have had .243's since the dinosaurs roamed the Ohio valley and know what shoots "good" in them,,,,,you will hear someone say that a certain bullet shoots the best groups he has ever shot with a particular gun ,,,,and the groups are 1-1/2 moa!!!???/.....I have shot just about every bullet made in 14 twist and 8 twist proven "B"enchrest rifles and many factory guns that I have sorted thru to find a "good-un" and with a factory 9-1/4 twist (which is even better than a 10 twist ),,,,my personal results are with factory bbls "best"accuracy is with bullets with BC of less than .430 and no longer than 1.090".......of cours this is just "me" saying this,,,Roger