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Reloading Forum >
Free Bore Length Rule of Thumb?
Free Bore Length Rule of Thumb?
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mna55
1 post
Sep 09, 2004
12:51 AM
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Is there a rule of thumb as to the proper free bore length for the different bullet weights? I'm Chambering a 1 in 8 barrel and would like to shoot the 100s as well as the 80s and 90 weight bullets in it. But I don't want to throat it to exclude any bullet I don't have too.
Last Edited by mna55 on Sep 09, 2004 12:52 AM
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Moderator
35 posts
Sep 09, 2004
7:32 AM
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MNA55,
You should read the articles by Dave Kiff (Pacific Tool & Gauge) and Danny Reever on the home page under "Advice from the Experts". Dave makes 6BR and 6 Improved Reamers. He writes:
"Q: Without revealing any trade secrets, what throat lengths do you recommend for a 6mm BR case?
We normally go with a 1.5 degree lead angle, unless the customer wants something different. For 60-68gr bullets we recommend a .060" freebore. For the 80gr bullets, .080" is a good setting. For the 100-107gr VLDs, a .115" -.120" freebore will allow you to get the base of the bullet up out of the doughnut area. This will save you lots of aggravation over the life of the barrel."
A .070-.080" freebore should work well for the 80-90gr bullets and still let you run the shorter bullets. You want to keep the base of FB bullets, or the upper end of the boat-tail section at least .050" above the neck-shoulder junction to avoid interference with brass build-up (the "doughnut").
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mna55
2 posts
Sep 09, 2004
8:31 PM
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Moderator, Thanks for the infomation, I will read up on both of the articles.
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