I'm trying my hand at making a set of swaging dies for 45 acp projectile. That would be .451 in diameter. As my limited knowledge says to me that to make the best (read smoothest finish) precise hole would be to use a reamer to finish the hole.

I've found a .451 chucking reamer on line. And in my Machine tools, and machining practices handbook, it states that the hole be drilled .001-.006" smaller than said reamer. Now my drill chart shows the nearest drill to be a 7/16" which is .013" smaller.

Can someone please school the amateur how this is to be accomplished

Thanks in advance

Brock in AR

I've found a .451 chucking reamer on line. And in my Machine tools, and machining practices handbook, it states that the hole be drilled .001-.006" smaller than said reamer. Now my drill chart shows the nearest drill to be a 7/16" which is .013" smaller.

Can someone please school the amateur how this is to be accomplished

Thanks in advance

Brock in AR

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