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Normal Topic Reamers for breech seating. (Read 2201 times)
boho
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Reamers for breech seating.
Dec 17th, 2016 at 8:29am
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I am looking for an education on reamers used to B/S lead bullets. How do they differ from one that would cut a chamber for fixed ammo. When ordering a reamer for a rifle that will only be B/S Is there some rule of thumb? What makes a good reamer for competition shooting, breech seated lead bullets ? Is there any difference or would any reamer designed for lead bullets be acceptable? What makes a reamer a "lead bullet" reamer? Is there such a thing as a breech seating only reamer? If we were designing a hypothetical 32-40 reamer for B/S what would it look like.
  
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frnkeore
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Re: Reamers for breech seating.
Reply #1 - Dec 17th, 2016 at 2:21pm
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To begin with, BSing has a little bit different, internal dynamics. You don't have bullet in the case to expand the neck, when fired

Because of that, powder gases can get behind the neck and collapse it. BSing chambers, that the Golden Age, ODG' s corrected by using a straight tapered cases with no neck area.

Thier throats, had just a angle, forward of the case, down through the lands. That type of throat will shoot but, needs a bullet with about .004 taper, many of Popes bullets had a full .006 taper.

For modern throats, with freebores and long leads, cylindrical bullets or bullets with just .001/.002 can be BSed w/o damage. But, either way, the bullet has to leave the barrel with as little damage as possible.

So, what a basic BS chamber is, is one with a straight taper and no neck.

Frank
  
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Schuetzenmiester
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Re: Reamers for breech seating.
Reply #2 - Dec 17th, 2016 at 3:12pm
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Original chambers like Pope's were made for muzzle loading as well as breech seating.  The case ends, there is a few thousands transition and the rifling starts.  Requires a tapered bullet and mechanical leverage to seat but it works just fine.
  
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