Using bushing dies for a tight chamber.

[jlow]

I actually don’t have a tight custom chamber but was just thinking about this the other day so I thought I would ask. So with a bushing die, since you do not size the whole length of the neck, does this cause a problem when you are using a tight chamber? Seems like the unsized part of the neck may be problematic.

FWIW, this is just a mental exercise and not an actual problem.

 

[Preacher]

The part of the neck that is partially sized has nothing to do with a tight chamber or not, and actually helps align the case in the chamber..
You can have a no turn neck and a tight chamber, or you can have turned neck in a tight chamber, and that unsized part of the neck is still not a problem..

 

[jlow]

Thanks bu sorry, still slightly confused. What I understand is that the final size of the neck i.e. with the bullet in it has to be less in diameter than the neck part of the chamber. Presumably if one is jamming, there might not be a bullet in the aft part of the neck and so if that part of the neck is larger in diameter than the chamber, would that not cause a problem. Like I said, I don’t do this and so I can easily be missing something, thus the question.

 

[fdshuster]

jlow: preacher said it all. Don't lose any sleep over mental exercises.

 

[Tozguy]

The neck before sizing has been blown out to the walls of the chamber but the brass springs back in again after the event of firing. That's why the case can be removed from the chamber. However this spring back is not usually enough to allow the neck to hold a bullet again. When the neck gets sized it squeezes the brass down even more than sprang back so that it will hold a bullet. The inserted bullet will push the sized part of the neck out but only to somewhat less than the unsized part of the neck. It will not change the unsized part .

For example:
Chamber neck = .271
Loaded neck = .269
Fired neck = .270
Sized neck = .268

Unsized neck can never be larger than the chamber.

 

[jlow]

Cool, that explains it completely. My mental excercise is done! THANKS!