According to Mr. Hugh Henriksen, there is some misunderstanding of free bore. For example my 6 PPC reamer has a nominal .025" free bore, but the chamber has an overall length of 1.515. Therefore, the effective free bore is at least .040". If I understood him correctly, the length of the chamber in front of the case mouth must be added to the nominal free bore of the reamer. Good shooting...James
What is your real free bore length?
- Thread starter JDMock
- Start date
ridgeway
Silver $$ Contributor
I too believe the freebore depends on the OAL of chamber. One reamer with a freebore of .130 and a chamber OAL of 1.560 will be different than a reamer with a chamber OAL of 1.570 and same freebore of .130. The longer chamber OAL will require a longer loaded case OAL to reach the lands. That's my take on it...
Yes. I did not take the chamber length into account on one reamer I ordered. The freebore of the reamer PLUS the difference in case length/ chamber length AND the small "hidden" freebore of the angle cut where the chamber ends and bore begins gave me way too much distance before a seated bullet touched the lands...case was a 22brx with a short neck.
I just had a chamber done and thought I too had a freebore that was way too long. I was trying to find the lads with a Hornady tool and a modified case. It would push the bullet almost completely out of the case before it stopped. Something just didn't seem right. I seated a bullet where I thought I would be about .010" into the lands and marked the bullet with a sharpie to see land engagement. It was almost a perfect .010". I'm not sure why this chamber let the bullet go so far into the leade before the billet stopped but I'm using the marked bullet as a starting point for seating depth measurements.
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