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December 18, 2011
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do the individual cartridge slots on 357 sm cylingers have a taper at the end (just before the bullet enters the barrel) or is the dimension uniform from front to back? kind of a silly que. but am curious...thanks
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January 24, 2009
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Revolver cylinders will have a "shoulder" at the front of each chamber. It's not tapered, but an actual straight shoulder or ridge. I know there's a better term, but my brain can't recall it today.
The shoulder is positioned right where the mouth of the brass case is, when you slide a round into the chamber.
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Range Officer
Range Officers
May 2, 2009
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Charger Fan said:
Revolver cylinders will have a "shoulder" at the front of each chamber. It's not tapered, but an actual straight shoulder or ridge. I know there's a better term, but my brain can't recall it today.
There is also a slight constriction at the face of the cylinder holes--if you try to slip a bullet in from the front you will see how tight it is. On a revolver designed for accuracy/match, this is a critical finishing area.
SHOOT
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January 24, 2009
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SHOOTIST357 said:
There is also a slight constriction at the face of the cylinder holes--if you try to slip a bullet in from the front you will see how tight it is. On a revolver designed for accuracy/match, this is a critical finishing area.
SHOOT
Are you saying it does have a taper, then? I don't have anything to measure that with, so maybe I misspoke. Using my micrometer eyeball, it looks straight...does that count?
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Range Officers
Dans Club
February 28, 2009
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Not a taper, just reduced diameter beginning at the point where the front of the case should seat and going forward from there. If you look into the chamber from the back you will see the ridge. It's approximately the thickness of a cartridge case wall.
-Mike
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Range Officer
Range Officers
May 2, 2009
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Here you go--this is better/faster than any of us explaining it.
http://www.gunblast.com/Brownells_Reamer.htm
SHOOT
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January 24, 2009
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zoommb said:
Not a taper, just reduced diameter beginning at the point where the front of the case should seat and going forward from there. If you look into the chamber from the back you will see the ridge. It's approximately the thickness of a cartridge case wall.
-Mike
Ok, that's better. I was thinking correctly, then.
December 18, 2011
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that article is very eye opening. i am sure on of you fellers will/have already checked the dans. if you have keep me/us informed...and thanks
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Dans Club
February 22, 2009
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As Shoot said, this is a critical dimension, particularly when shooting lead bullets. I check all my cylinders with a pin guage. The dimension should be the same on all throats and the throats should be just slightly larger (.001-.002) than the bore diameter. Otherwise you could experience leading issues. It's not as important when firing jacketed bullets.
The issue at hand is bullet obturation. Lead bullets need to completely seal the gas, in the bore, behind the bullet. Otherwise there is lead cutting that will leave streaks in the bore. To complicate matters, leading can also be caused by poor lube, amount of lube, velocity, bullet hardness, etc...
That's why I cast my own- I don't enjoy sanity; its not normal.
Best Regards, Ron
Technically, the glass is always full; half liquid, half air....
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