Step inside revolver chamber

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backpacker336

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The cylinder in the photo is a 32 cal M&H (rimmed cartridge) just wondering why they have this shoulder inside the chamber.
 

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Would shooting a shorter case(.32swshort) with a lead bullet cause problems? The original .32 M&H long was between a S&W.32 and S&W.32 long.
 
It's basically the throat of the chamber:
barrels.jpg


BUT, in a revolver that is a straight wall case, and you are seeing that small little angle :
st_lowdownleadfoul_201002-a.jpg


What is being seen is the step/ledge/angle that is shown above in the cylinder between the bullet and the case.

For shooting a shorter ammunition in a revolver: if the casing diameter fits, the bullet is the same calibre, and the shorter case is not over powered (Ie: won't blow the gun up) the biggest problem is now that case end doesn't fit at that step/ledge/angle so you get a lot more gasses. You can also in some situations (some, I'm not getting into specifics) burning of the metal of the cylinder and end up with 'mini pot holes' or other metal loss (reader warning: extremely basic description and warning).
 
That "throat" in a cylinder should all measure the same diameter and not be smaller than the bore of the barrel for best accuracy.
 
I suspect that if the cartridge used a heeled bullet, that step might be omitted, and the chamber reamed straight through.
 
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