In another thread it was suggested to use both full length bushing dies, and a mandrel. Can someone explain the reason for needing both? I haven't been able to fully wrap my mind around the idea of needing a mandrel because I thought the reason for using a bushing die was to get exact neck tension.
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So I'll use 6.5mm as an example here... I see that the Sinclair expander mandrel for 6.5mm is .263 (which would make -.001 neck tension). Do they make one that is .262 instead? If I get a bushing size to get -.002 neck tension, wouldn't I want a mandrel size to match?