510 Whisper Build Advice (Stock/Bottom Metal/Magazines/Twist/Barrel Length)

[45-90]

Instead of outside neck turning each case, could one not machine a dummy chamber and run a precision reamer down the inside of the neck? I bought 400 cases and it's going to be SLOW to turn the OD on each one.

Edit: I could bush the reamer to run concentric w/ the neck in the cartridge holder.

I just tried it in a lathe...it won't chamber...

Cut 338 Lapua case to length leave only a bit extra to final trim length.

Use your sizing die WITHOUT the expander ball and lube;& size.

Made a steel case holder similar to Wilson to hold the case for boring.

Bore case wall to around .013

Put expander ball back in ...use some Lee resizing lube on the inside of the case and expander ball, pump it into the FL die with the die all the way down, redo the bottoming out on the shell holder a couple of times.

But it still does Not fit my gauge or the rifles chamber.

Here's why...the die doesn't have the sharp 7 degree shoulder needed. The die is made to neck turn the shoulder.

I could make this work by making a die in the lathe to push the shoulder back at the correct angle since its so close...but pushing sharp shoulders it not friendly to brass cases...they'd rather collapse and buckle rather than move, especially anything sharper than 30°.

Since I have a lathe it's easier for me to neck turn ( about 15 seconds in and out) and work with the factory die as originally designed rather than doing these extra steps.
The runout was within .001" on this sample, and is always good with a snug fitting mandrel and a lathe.

So that's why they are neck turned...but this way is very close and only a tiny bit of neck turnig would be needed to get this to fit the gauge and the gun.

Use any part of this procedure if it will make your case making easier...

I could make the final die but this way takes more time, right now...and I'm not in the die business for others, and have other projects I'm working on.
It's just another way, that will work, if I make the final die.
Might do it later just for fun...but that doesn’t serve anyone but me. And I have all the 510 whisper cases I need.
It's a fun caliber with many power levels, too bad the industry who created it doesn't support it better. Starline could easily produce cases for it...

 

[45-90]

So I went out and did it.
Built a double die, cause it needs a sharp shoulder to finish up the last tiny bit.

First die hornady die, 2nd die home made with a sharper shoulder. Then the other side of that die or 3 rd die to shave the sharp shoulder...it leaves metal shavings in the die so it needs cleaned and the case od deburred.
It finally fits the rifle chamber and a primer inserted to test fire the case.

So it can be done, but it takes longer then neck turning in a lathe.
But its only the final 1/16" that needs to be neck turned as you can see on the photos where it won't completely enter the gauge, when you ream or bore the neck ID for thickness first.
The last die with the sharp edge takes care of that 1/16".

So it's possible if ya want to try something different, but the whole idea was to neck turn and use the FL die to set the headspace.