20x47 Lapua problem

[DeSilva]

Hi All

This may sound noobish but im trying to size my cases for my new custom rifle (when it arrives). The trouble im having is when i neck down the cases i get a slight bulge at the junction at the base of the neck where it meets the top of the shoulder. My process is as follows :

Take std Lapua 6.5x47 brass and run it through the 6x47 FL die
Then run it through a 22x47 neck sizing die
Then run it through a .260 bushing
Then through a .246 bushing
Then through a .238 bushing
and finally through a .230 bushing
After this i neck turn to 14.25 thou which will give me 20 thou neck tension.
Bullets seat nice (berger 50 grn & 55 grn @ .2035" dia) but there is still a slight bulge at the said junction.

Can anyone who help me to explain how i get rid of this bulge.

I think possibly the fault of the bulge could be that the junction in the die is not a sharp edge where it meets the bushing but indeed a step (somewhere for the brass to flow into during the necking process).

Im not sure if fireforming would help as even though this bulge is small im not sure the case would even chamber with the bolt closed.

Any advice would be really appreciated.

Many thnx in advance

 

[remiglockoholic]

Re: 20x47 Lapua problem

Mind posting a pic of what you're referring too?

 

[Brasscow]

Re: 20x47 Lapua problem

It's due to it being a bushing die. I'm not sure if anyone makes a 20x47 lapua full length sizing die, but you need just a standard full length sizing die for that case. You can then either turn your necks to get the neck tension you want or you can have whatever die it is you purchase honed out by the manufacturer.

Good luck - it is possible that no one makes this die and that you have to have a reamer made for cutting the die. That or you can live with the bulge at the neck/shoulder junction.

 

[DeSilva]

Re: 20x47 Lapua problem

the bulge seems to remain pretty constant with each sizing

here you go

 

[remiglockoholic]

Re: 20x47 Lapua problem

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: brasscow</div><div class="ubbcode-body">It's due to it being a bushing die. I'm not sure if anyone makes a 20x47 lapua full length sizing die, but you need just a standard full length sizing die for that case. You can then either turn your necks to get the neck tension you want or you can have whatever die it is you purchase honed out by the manufacturer.

Good luck - it is possible that no one makes this die and that you have to have a reamer made for cutting the die. That or you can live with the bulge at the neck/shoulder junction.</div></div>

^^^ This is what i was thinking, i'm sure you can contact hornady or another bullet manufacture and have a die made.