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Most finish reamers have the throat and lead built in. It would be very rare to have that portion done separately so someone specified that length.
There are instructions for pouring chamber cast here on the forum somewhere.

One correction, TMack. The chamber controls the headspace. It's up to you to feed it the proper brass. It sounds like the headspace is correct.
Some Weatherbys have DOUBLE that amount of freebore.
 
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