Thread: What causes this

Man it pisses me off

happen when your seating the projectile?
Maybe not a big enough chamfer on case mouth?

Seating die set too low or brass needs trimming.
Trim all brass to same length put one in shell holder put ram right up. Wind die down till it touches neck and wind back up half a turn. Lock it and adjust seating depth from there.

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both cases were once fired untrimmed

happens when seating projectile, i push alittle too hard right at the end of the stroke and it crumples
If I seat softly it dosent happen

so trimming could well be the issue

looks like hydraulic damage

ie too much lube is being pushed into the shoulder of the die and hydraulically damaging the case shoulder.

Originally Posted by veitnamcam

Seating die set too low or brass needs trimming.
Trim all brass to same length put one in shell holder put ram right up. Wind die down till it touches neck and wind back up half a turn. Lock it and adjust seating depth from there.

What VC said, looks like your seating die iis contacting your brass. Surely you must feel the pressure difference when this happens? Is it occuring all the time or only on the odd case? if its the latter it sounds like its probably time to trim your brass.

Originally Posted by sakkaranz

looks like hydraulic damage

ie too much lube is being pushed into the shoulder of the die and hydraulically damaging the case shoulder.

If this was the case wouldn't that happen before he seating bullets? Photo Looks like this is occuring while bullet seating?

it only happens when i think it needs to go a mm more than it wants to.
then instead of the stroke continueing differcltly it gets real easy while it crumples

is it possibel it is caused from excess lube on the outside of the case neck causing that grip?

it happened on the first case today 243 and mid run of the 280
only one every now and then

definitly happens when seating the pill

I looked at the photo at first and thought that the red tip had fallen if the left one haha

Haha na that's a targex 95gr and a 162 amax

Are you doing a VLD chamfer ?

Are you lubing inside the neck and the projectile?

How much neck tension are you using ? (Measure neck OD before and after seating)

i lube inside the of the case when sizing but not the pills

ill have to load a few more to see neck tension

whats a vld chamfer?
I chamfer my cases before bullet seating

A VLD chamfer tool cuts a 22 degree internal chamfer on your brass to allow less deformation of VLD projectiles when seating them, it achieves its goal by allowing more precise lead in and less effort required to start the seating procedure.

The standard 45 degree cutter is mostly obsolete these days.

Another look at your brass and my guess is there is too much seating friction, either its dirty inside the neck/neck tension is too high/wrong lube.