if, at the top of the stroke you are trying to drive the expander ball thru the bottom of the case, it will require a lot of force.
i use that exact set on 2 long range target rifles, myself and my daughter have shot in competition out to beyond 1100 yards. with ammo madeusing that dieset, chambered in 6.5x55.
if they were no good, i recon i would have worked it out by now.
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