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#3
10-15-2014, 10:50 PM
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freebore length is .1300
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#4
10-15-2014, 11:21 PM
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I would read the freebore as 0.1163. If one included the 45* section from the end of the case neck, one would never have a chamber with a zero freebore. The .1300 dimension is the 45* section plus the freebore.
__________________
John Last edited by JohnHenry; 10-15-2014 at 11:38 PM.
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#5
10-15-2014, 11:34 PM
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Look below the area and it's measurements and it tells you which is the lead(should be Leade ), .130" on this print, and what is the throat,.1163"@3 degrees 6 inclusive.
__________________
"That which does not destroy me, has made a huge tactical error"
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#6
10-15-2014, 11:51 PM
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I read this print as 1.163" for the lead, ie: freebore.
The freebore or leade is that distance of parallel section which is 2.435" in diameter between the end of the total chamber and the start of the throat. This is as Dave Kiff explained it to me. If you include the throat in the measurement, then it would be impossible to order a 0 leade or 0 freebore reamer. As D. Clements, I and many other have done this, none of the throat is included in the lead's measurement. With a 0 lead or 0 freebore reamer, the throat, whatever angle it is, starts at the end of the 45degree (also known as the "nasty little shoulder") chamber mouth. This is how I understand reamer nomenclature.
__________________
Daryl
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#7
10-16-2014, 12:01 AM
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Agree, .1163 is the freebore, the length of the straight cylinder section of .2435.
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#8
10-16-2014, 01:21 AM
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I stand corrected! I was able to enlarge it on my IPhone and the Leade is .1163" and the Throat is .1001"@3 degrees, 1.8002-1.7001. I apologize to all for my aging eyes.
__________________
"That which does not destroy me, has made a huge tactical error"
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#9
10-16-2014, 01:25 AM
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Nope if you run brass all the way out to chamber max. you would need to cut at 45* to get to end and start of straight length. length is .130 by the way there is really no such thing as a "zero" freebore its impossible to dress a wheel to a totally sharp corner about .010 radius is about as close as it gets..
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#10
10-16-2014, 02:14 AM
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George - we are talking about the straight parallel section, nothing to do with the normal 45 degree mean shoulder. The lead is the parallel section, ie: freebore, as described by the reamer maker. With a "0 lead" reamer (my .17AH and .17AB reamers), the rifling angle, ie: throat, starts immediately at the end of the 45 degree shoulder at the end of the chamber. There is no parallel section. This is how .45/70's have been chambered in repeating rifles ever since 1881, when Marlin developed the first one, the model 1881.
It is also how we can chamber up a .17AH and have the base of a 20gr. Vmax and 25gr. HP Hornady sitting at the top of the shoulder/neck junction, yet touching the throat.
__________________
Daryl
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