My First hydroformed 6 Dashe case. how does it look?

[Linko]

Great info guys.

 

[Linko]

I have a related question.

If the hydroforming process leaves a "almost" dasher shape and then after the fireforming the case reaches the final shape, what about the headspace?

there is going to excess headspace when you fire the first time, I popped a few cases in a Wilson case gauge. How much of a case charge is normally done for the first firing?

 

[LRPV]

I blow them a little long, bump them back just like a fired case, load them up with whatever my match load is and use them for sighters. I anneal them before hydro forming because they seem more consistent (even though they should be ready to go out of the box) and again after hydroform. Have fun.

 

[drano38]

+1 on LRPV's comment - hydro form them a bit long (so your bolt won't close on it), then use your full-length resize die to bump them to the fit you want (.002 less then chamber, etc).
Then you'll have good headspace on the first firing. Develop your load, then tweek it again for the second firing - it may change, it may not.

 

[Dave Way]

I just Hydro formed my first 6 dasher (lapua) case. how does this look?

View attachment 1156654

It looks like a lot of work but I’m used to just pulling the trigger to form BR Ackley cases. I hope the rifle shoots well for you.

Dave.

 

[golong]

It takes a bunch of work to get them close, and it is possible to push the forming process too hard to where you blow the shoulder in the forming die - I did just that on one piece. While I don't remember exactly how much the die will allow them to stretch, I do recall that not getting much in the way of feel on the sizing die afterwards was common. And that was with them being longer on average than what DJ says his formed brass is.

As long as they are close they will shoot and finish forming just fine.

 

[L W P]

Here is my latest caseView attachment 1156988

What hammer did you use, Rubber mallet or dead blow?

 

[rwj]

Like most of us, it just needed a good beating!

I wore out the seals on the Whidden die plunger o rings. They are a great place to do business. Always helpful and ready to support their products. new seals on the way. (bit of a learning curve for me in general, doing a hydroform case).

If you’re able/willing to make the oring groove wider, backup rings can be installed that will prevent the orings from being extruded thereby improving their performance (minimal leaking/higher pressure) and service life. They’re commonly used in high pressure applications.

 

[Cowtownup]

Is there a need to have the bolt close snug on this hydro formed brass on the first fire? Or does bumping it back to .001 under for say a bolt handle that just drops with the firing pin out work just as good?

 

[LRPV]

No need in a snug bolt close.