Outside Turn or Inside Turn for Neck??

[jiwilliams]

Assuming we want uniform neck thickness, which is better, inside neck trimming or outside?

I assume that a fired or resized case would have a uniform exterior size and that the high/low spots would be on the inside?

 

[Eddie Harren]

Most people turn the outside. Insidede reaming is normally done to remove a "doughnut".

 

[mikecr]

How would you turn the inside of your necks?

That is, if you desire .012" thickness, how could you get it other than traditional neck turning?

 

[vmthtr]

The inside neck reaming is to remove large amounts of brass and then you still need to outside turn to get the uniform thickness all the way around. Reaming came about when guys where using USBR brass, which is a straight wall 308 with a small primer to form down. A reamer follows the hole and does nothing for case wall uniformity.

Mike

 

[Cheechako]

Inside neck reaming was the preferred method of thinning and uniforming wall thickness up until the end of WW II. But since a reamer will always follow a hole, it never did produce uniform wall thickness and so shooters began to opt for a mandrel and outside neck turning, the method that is preferred today.

An inside reamer such as the old Lee Target Loader actually is a miniature boring bar and so it will result in uniform neck walls, as will similar tools. The problem there is that you are limited to whatever thickness the tool produces.

Today, inside reaming is used, as others have said, to remove a doughnut or to remove gross neck thickness prior to outside turning.

Ray

 

[Eddie Harren]

USBR Brass? Straight walled? I've got a case or two of the old URBR brass, leftover from my Hunter class days, that is 308 small primer pocket. Never saw any straight walled.