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BR tools are not the best....
Those knock-out dies may be your problem. Neck sizing is easier and the benchrest guys love it - but did you know that the vast majority of top longrange competition shooters full-length size their cases every time?
They find that setting the shoulder back a few thousandths each time improves their accuracy. This has been well known for decades, yet it seems that all the general shooting public hears is what the benchrest guys do. If it works in BR it must be the best, right? The dirty little secret in BR case sizing is that top competitors today use a shoulder-bumping die to accomplish the shoulder setback - but how many folks outside the BR community have heard about that?
If I have difficulty getting enough accuracy during load development I will make sure I full-length size the cases, smoking the shoulders so I know I am setting them back very slightly. Try it.
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