Neck sizing question...

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Bruiseleee

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If you neck size, do you need to trim the brass to length each time?

Or does the fireformed case match the chamber so that it no longer stretches during firing?

:confused:

One of those questions that one thinks up during the drive home. :)
 
Bruiseleee said:
If you neck size, do you need to trim the brass to length each time?

Or does the fireformed case match the chamber so that it no longer stretches during firing?

:confused:

One of those questions that one thinks up during the drive home. :)
Click to expand...



The neck sizing process can stretch the brass so trimming will be beneficial.
I always chamber the neck sized brass to be sure it will function before reloading.
 
Check the length of your brass before and after firing. Chances are that it will grow more the first time firing it after resizing than subsequent times. This is what I have found anyhow.
 
Neck sizing does not stretch your cases. Firing them does and so does full length resizing. Once you get to know your rifle, and you're good at tracking what you've done with your cases, you can cut small corners.

With my 300 win mag, after a first time firing, I neck size and then trim to length. I then know for experience that I can fire them again, and just neck size because they just don't stretch enough to present a problem. THIS IS BY NO MEANS THE RULE FOR EVERY GUN !!! If you're in doubt, trim your cases to length after every firing.
 
With my .308 I trim to 2.000 after full length resizing. I will then neck size only until it get I need to use a little force to close the bolt (no more that two fingers pressure). Then either resize again or run them through a body sizing die. I have let them go up to 2.015"-2.017" before timming again without a problem. These are being shot in a bolt action target rifle with an Obermeyer match camber.
 
"...trim the brass to length each time?..." You shouldn't need to trim every time necked sized or FL. Only trim if the case is longer than the max. Don't forget to chamfer and deburr after trimming.
 
blacksmithden said:
Neck sizing does not stretch your cases. Firing them does and so does full length resizing. Once you get to know your rifle, and you're good at tracking what you've done with your cases, you can cut small corners.

With my 300 win mag, after a first time firing, I neck size and then trim to length. I then know for experience that I can fire them again, and just neck size because they just don't stretch enough to present a problem. THIS IS BY NO MEANS THE RULE FOR EVERY GUN !!! If you're in doubt, trim your cases to length after every firing.
Click to expand...


I neck sized some 300 Win mag brass after a range trip today,and they did stretch 2 thou after neck sizing only. I measured the fired case before and after neck sizing.The overall case length did not stretch enough to become a chambering problem, but it did stretch the neck in the process. Yes, neck sizing can stretch cases.........
 
i think it depends on the die as well. my redding comp dies go through the press on the upstroke with ease (when the exanding ball on the decap pin gets removed from inside the brass). but when I had a lee die man that thing too some serious effort on the upstroke. probably because the redding only sizes the neck to what bushing you selected, where the lee one shrinks it much more so the exanding ball is much tighter on the way out.

on the lee die I bet forsure that brass gets streched a little, I just cant see how it couldnt.
 
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