Yep as said you have the flexibility to alter neck tension. Bushing dies are pretty much essential if you are also neck turning. I have to neck turn for a couple of my rifles, and therefore you pretty much have to have bushing dies to then be able to alter the amount that you size the neck.
Since ive started neck turning, and using bushing dies, and annealing, i now have very consistent neck thickness and i can tune the neck tension to what the rifle likes and gives best performance. And im am noticing the difference in precision at longer ranges.
Consistent neck tension is arguably the most important factor in achieving a level of precision and tight grouping with ammo.
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