wow..once upon a time manuals suggesting using a file to take a bit off the case and measure with calipers.... Ive used even cruder methods than that before with ok results....we make things more complicated than need be at times. personally I use the lee case trimmers.too easy.
you can get away with a shorter 6.5 pilot if you measure lots.....I use a 7.62x39mm trimmer to do .308w this way.
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