when you use a neck sizing die only, do you still have to trim the cases? I figure you do, but is it easier on your brass?
noob neck sizing question
- Thread starter glockdan78
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Re: noob neck sizing question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: glockdan78</div><div class="ubbcode-body">when you use a neck sizing die only, do you still have to trim the cases? I figure you do, but is it easier on your brass? </div></div>
You asked a good question
Yes you do have to trim when needed
Easier on brass = yes it is
You will need to FL re-size to push your shoulder back if bolt close isn't working so watch that as well
Good luck
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: glockdan78</div><div class="ubbcode-body">when you use a neck sizing die only, do you still have to trim the cases? I figure you do, but is it easier on your brass? </div></div>
You asked a good question
Yes you do have to trim when needed
Easier on brass = yes it is
You will need to FL re-size to push your shoulder back if bolt close isn't working so watch that as well
Good luck
Re: noob neck sizing question
So is the case stretched longer from firing or resizing? Or both. I was under the impression that the full length resizing is what really "stretched" the case.
So is the case stretched longer from firing or resizing? Or both. I was under the impression that the full length resizing is what really "stretched" the case.
Re: noob neck sizing question
When I neck size my 243 I try to trim my cases, but nothing ever comes off. I quit trying to trim after I neck size. So I would just trim initially and then trim them every 2-3 reloadings.
When I neck size my 243 I try to trim my cases, but nothing ever comes off. I quit trying to trim after I neck size. So I would just trim initially and then trim them every 2-3 reloadings.
Re: noob neck sizing question
Lets say you have a light pressure load that does not cause any wear whatsoever on the brass. The neck still has to expand to let go of the bullet and then get sized back down to hold the next one. During the sizing down of the neck it will grow in length.
This is just Murphy's Law being played out in the sizing of brass cartriges.
Consider what would happen if the neck just sized back down to where it was and did not grow--all that brass that grew and shrunk would end back up where it started.
So what really does happen is that as you apply large (58K PSI) pressure to the brass of the neck in order to size the neck, the minute sliver of brass being sized, almost squirts up the side of the sizing die, and cause the neck to grow in length.
Same thing happens when you size the body.
I run my cases through my trimmer every time, generally taking off just a tiny sliver of length, and giving me a nice flat face to chamfer and deburr.
Lets say you have a light pressure load that does not cause any wear whatsoever on the brass. The neck still has to expand to let go of the bullet and then get sized back down to hold the next one. During the sizing down of the neck it will grow in length.
This is just Murphy's Law being played out in the sizing of brass cartriges.
Consider what would happen if the neck just sized back down to where it was and did not grow--all that brass that grew and shrunk would end back up where it started.
So what really does happen is that as you apply large (58K PSI) pressure to the brass of the neck in order to size the neck, the minute sliver of brass being sized, almost squirts up the side of the sizing die, and cause the neck to grow in length.
Same thing happens when you size the body.
I run my cases through my trimmer every time, generally taking off just a tiny sliver of length, and giving me a nice flat face to chamfer and deburr.
Re: noob neck sizing question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: glockdan78</div><div class="ubbcode-body">So is the case stretched longer from firing or resizing? Or both. I was under the impression that the full length resizing is what really "stretched" the case. </div></div>
When FL sizing the case gets longer from squeezing the body, then the shoulder is pushed back, if you have set up your die correctly(NOT FROM THE INSTRUCTIONS) but with a headspace gauge, shoulder bump should be .001-.0015, the case neck does grow when fired, some cases more than others depending on chamber, case, load, etc etc, trimming to a unified length is important, but 90% of the reloaders on this site trim there brass too much, 5% don't trim at all, and the rest have used a Chamber Length gauge from Sinclair Int to correctly determine there trim length, which is .010-.020 less than what the gauge says your chamber length is, my advice is not to trim to book minimum but .010 longer until you determin what your exact trim length is, and don't swet .001-.002 differences because very very few of us can shoot the difference.
Also a properly set up FL die produce very accurate ammo, and brass will last until the primer pockets won't hold in primers, which is also how long brass NS only will last, and will chamber every single time.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: glockdan78</div><div class="ubbcode-body">So is the case stretched longer from firing or resizing? Or both. I was under the impression that the full length resizing is what really "stretched" the case. </div></div>
When FL sizing the case gets longer from squeezing the body, then the shoulder is pushed back, if you have set up your die correctly(NOT FROM THE INSTRUCTIONS) but with a headspace gauge, shoulder bump should be .001-.0015, the case neck does grow when fired, some cases more than others depending on chamber, case, load, etc etc, trimming to a unified length is important, but 90% of the reloaders on this site trim there brass too much, 5% don't trim at all, and the rest have used a Chamber Length gauge from Sinclair Int to correctly determine there trim length, which is .010-.020 less than what the gauge says your chamber length is, my advice is not to trim to book minimum but .010 longer until you determin what your exact trim length is, and don't swet .001-.002 differences because very very few of us can shoot the difference.
Also a properly set up FL die produce very accurate ammo, and brass will last until the primer pockets won't hold in primers, which is also how long brass NS only will last, and will chamber every single time.
Re: noob neck sizing question
Use the Sinclair Chamber Length Gauge to determine the actual length of your chamber (which is usually quite a bit longer than the SAAMI specs) and monitor your case length until they get close to that measurement then trim to about .005 shorter. Setting the shoulder back is what makes the case longer so only set it back just enough to chamber easily. Your chamber is your gauge.
Use the Sinclair Chamber Length Gauge to determine the actual length of your chamber (which is usually quite a bit longer than the SAAMI specs) and monitor your case length until they get close to that measurement then trim to about .005 shorter. Setting the shoulder back is what makes the case longer so only set it back just enough to chamber easily. Your chamber is your gauge.
