help fireforming dasher cases

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dansig

Guest
I was going to fireform for my Dasher so I googled and found some great info about case prep.. the problem is it doesn't work for my Dasher.

I have a .268nk, loaded round unturned is .2675 so it fits the chamber without resistance.

the info I found said I should turn the neck for false shoulders for that the neck would need to be bigger than the chamber..

I do need to turn the neck, I just don't want to turn it to far down since I haven't fireformed yet so I don't know how far the shoulders will move forward.

since I have almost no clearance with a loaded round I'm not sure it's ok to fireform without turning the necks first so what do I do ?

it's a long way to the range so experimenting with a couple cases each time is not possible...
 
You don't "Have" to form by using the false shoulder method with the Dasher. It is only one way to form these case's. Maybe a little more reading and research is needed...

RS
 
Go to acurate shooter.com. There is acolumn on th left. Go to ^br improved. When you pull that up you'll find a lot on the dasher improvement fireforming. I have a shooting buddy that uses one of these methods to form a 6.5 version. It works and is safe. He's using a new barrel he just fit to his action. It shoots very well at 200m while fireforming.
 
Sorry shoulda proofread first: accurateshooter.com 6br improved
 
I turned the necks so I have .0015 clearance filled the cases with N-135 and loaded 105 VLD so it will be very stiff in the lands.. hope that will work.

if this works then I will turn the necks after fireforming to a desired clearance.. whatever that might be...
 
dansig, I'll say this once, but strongly :)

"Do whatever it takes to get a crush fit headspace on your empty brass cases!!!"
Don't use the bullet to "hold the case back"
Don't use grease in your gun to "let the case slide back"
Don't be satisfied until EVERY CASE FEELS THE SAME after three-four firings, both in sizing and in chambering. In other words, if your cases size differently, if they don't EXACTLY MATCH for feel, then they're buggered up and cannot be fixed. This method of gaging for fit is predicated on you sizing for a slight "feel." Note that if you're sizing for no feel you're running the risk of casehead separation.

IMO, if, during this setup/learning curve you don't go through several frustrating periods of chasing your tail, IF you don't, at some time feel "this is impossible!" Then you're not appreciating the difficulties, the challenges presented in forming good cases....... also, in my opinion if this gun doesn't shoot as well as your other one you need to re-evaluate your case-forming methods, don't blame the rifle!


opinionsby



al
 
I think you will be happy with these results. I have used the hard jam method for all of my Dasher forming and have always had very good results. I know a few folks who do this and have good accuracy with this way of forming the Dasher Brass. I personally have a dedicated fireforming barrel made from an old 6PPC barrel and the twist rate is too slow for good accuracy with any bullet that will reach the lands but I am not adding barrel count to my match barrels either. Always a trade off.

RS
 
Roland, do me a favor???

Kill a few primers by soaking them in acetone or MEK. Pick out the sludge with a pin, leave the anvil in place.

Make up some EMPTY dummy fireform rounds with the bullets seated long.

TEST THIS :)

Pull the trigger on them......

I think that you'll find that bullets held long CANNOT HOLD THE CASE BACK.
 
as for holding the case back I have no other option than use the bullet.. unturned case loads without resistance so I cant use the neck to hold it back.. I do not have 6.5mm expander mandrel and it takes about 2 weeks to get one from Sinclair.

I fireformed my 6ppc cases the same way without any problems...
 
Alinwa in dead on

I have done the same testing years ago. Seating the bullets long will NOT hold the case against the bolt face. If you do not do this, you will stretch the web or worse, separate the head. Always remember, reloading a new cases after fire forming is nothing than repair work!! If you stretch the web, it's a waste of time. I always headspace with a crush fit on the go gauge. Lil secret amongst accuracy smiths, especially BR smiths.
 
dansig said:
as for holding the case back I have no other option than use the bullet.. unturned case loads without resistance so I cant use the neck to hold it back.. I do not have 6.5mm expander mandrel and it takes about 2 weeks to get one from Sinclair.

I fireformed my 6ppc cases the same way without any problems...
Click to expand...

You do have an option, expand the neck UP one or two calibers, then resize the neck back down only enough to have a snug fit closing the bolt. This aint a PPC, it's a whole different animal.
 
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