three bbls/one reamer

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Given one reamer and a head space gauge, one loaded(dummy) round and three different bbls (same cal probally different bore diameters) is it possible to:

have all three bbls chambered with the head space exactly the same?
have all three bbls chambered with the exact seating depth?
bbls will be chambered for a Stiller Viper, no drop port
Thanks in advance
Tim Thompson
 
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I have several barrels, for my non drop port Viper, that have all been chambered with my reamer (a .262 neck 6PPC), by a machinist that has a very good handle on the chambering process. I can interchange brass between them. Because they are all from different manufacturers, and have different rifling forms (4 groove, six groove, ratchet, 5C, 5R) there are significant differences in the best load for each barrel, and even if they were more similar, I would treat them as individuals. Throat lengths are as close as the headspaces, being built into the reamer, but this is not to say that they all require the same seating depth with the same bullet to do their best work. Also, since they all have different round counts, the point at which a given bullet touches the rifling varies with the throat wear. As far as sizing goes, I use the same FL die for all of them. It is a very close fit to my reamer. Of course the die setting must be varied according to how work hardened a particular batch of brass has become.
 
Boyd,
I think I understand. Simply using the same reamer and gauge is sufficient as seating depth will vary soon as I work up loads, wear the throat etc. Can I infer from your post that trying to get the seating depths the same with a throater is moot. I would like to do what is the least complicated. Thanks
Tim Thompson
 
I believe that there is a micro adjustable reamer stop available that should come in handy for duplicating throat lengths when using a throating reamer (and for that matter the same headspace). A friend, who does his own work, tells me that hitting your marks with a throater is a touchy thing because so little metal is being removed. He has gotten better at it over the years, but at first there were some surprises.
 
As stated above different barrels like different seating depths. I don't think a large difference .0015 in bore diameter will affect it at all. Think about it. The reamer diameter will not change and the bullet will touch at the same place on the little larger bore because it is touching the reamed part and not the bore.
Butch
 
Do It All The Time. Every barrel I chamber will enterchange brass with every other rifle of the same chambering that I shoot in Competition.

I disagree with the seating depth thing. Regardless of how high the lands are, either .236 or .237 bore diameter, the bullet ogive contacts the lands at exactly the same diameter, because the part of the lead that the bullet contacts is cut by the reamer, and this will be the exact same diameter. The smaller bore diameter will, though, exibit a longer lead taper if examined with a bore scope........jackie
 
Thank you Mr. Schmidt!
One would think that after 60 years a body would learn to overcome his tendency to overthink and overcomplicate things. A problem that I have learning in this arena(supreme accuracy) is absolutely no experience with the machinery involved and it causes me to mistrust my common sense. I am old enough to know that there many things counter intuitive but this is not one of them.
Tim Thompson
 
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