Fire forming for a Dasher

[Raythemanroe]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.



Ray

 

[ridgeway]

Scroll down a few threads....this exact discussion is going on...

http://forum.accurateshooter.com/index.php?topic=3850282.0

 

[Charles]

Just did this last week for the first time got lengths from .1553 to .1.558 Worked great

 

[mr45man]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.

Only tight neck chambers require neck turning.
Really nothing to do with fire forming other than
the loaded round would not fit into the chamber unless the necks are turned first.

 

[ridgeway]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.

Only tight neck chambers require neck turning.
Really nothing to do with fire forming other than
the loaded round would not fit into the chamber unless the necks are turned first.

This is true, but I will also add the step where you stop turning serves a purpose for fire forming as well. The step contacts the chamber where the neck starts to headspace off of.

 

[potatoe]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.

Only tight neck chambers require neck turning.
Really nothing to do with fire forming other than
the loaded round would not fit into the chamber unless the necks are turned first.

This is true, but I will also add the step where you stop turning serves a purpose for fire forming as well. The step contacts the chamber where the neck starts to headspace off of.

I disagree with you there ridge, the false shoulder is what supports the case during firing not where you stop turning. If it needed that step where you stop neck turning then there couldn't be any no turn neck dashers, plus I fireform unturned brass with COW then neck turn them for a .268 nk barrel

 

[ridgeway]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.

Only tight neck chambers require neck turning.
Really nothing to do with fire forming other than
the loaded round would not fit into the chamber unless the necks are turned first.

This is true, but I will also add the step where you stop turning serves a purpose for fire forming as well. The step contacts the chamber where the neck starts to headspace off of.

I disagree with you there ridge, the false shoulder is what supports the case during firing not where you stop turning. If it needed that step where you stop neck turning then there couldn't be any no turn neck dashers, plus I fireform unturned brass with COW then neck turn them for a .268 nk barrel

I wasn't referring to a no turn neck. Where the neck turning stops is the false shoulder.

 

[Raythemanroe]

I was referring to a false shoulder

 

[ridgeway]

I was referring to a false shoulder

Yep, neck turn down to where the step contacts your chamber. Its a trial/error process since all chambers are not the same. I've made this photo in 2009 to help people visualize the process.

 

[L-46]

Are you guys forming dry or with case lube?
what gives better results?

 

[mr45man]

I use a LIGHT coat of oil on the neck/shoulder.
Dry works also, but for me it just makes sense
to lube as the neck gets shorter in the process.
John H.

 

[L-46]

I notice some FF dry with the false shoulder.
some use a bit of lube on the necks, which allows the neck to reduce in length, as the shoulder is blown forward.
I think hydraulic forming also gives a shorter case?

The case formed with lube is shorter and maybe thicker walled, by 20 odd thou.
Which method gives the most consistent case length?

 

[sroemer]

How do you know where to stop turning neck?....Errors there would affect headspace....I wouldn't think that would be enough shoulder if you are turning only a few thousands per side......I use 6.5 mandrel and then size in Whidden bushing die....Easy.....

 

[stgw77]

If you have your own reamer (and reamer print) you can do some math and easily calculate when to stop trimming and turning necks. I have one neck turning set for one cartridge and I do not change settings... it works good for me.

 

[johara1]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.

Only tight neck chambers require neck turning.
Really nothing to do with fire forming other than
the loaded round would not fit into the chamber unless the necks are turned first.

This is true, but I will also add the step where you stop turning serves a purpose for fire forming as well. The step contacts the chamber where the neck starts to headspace off of.

I disagree with you there ridge, the false shoulder is what supports the case during firing not where you stop turning. If it needed that step where you stop neck turning then there couldn't be any no turn neck dashers, plus I fireform unturned brass with COW then neck turn them for a .268 nk barrel

I will bet anything they are short,uniform blow length is the important…….. very important. I seek and get a length of 1.550- 1.553 and i use a 1.564 chamber…………. jim

 

[L-46]

I was just wondering how many folks turn half the neck when Fire forming for a Dasher? Would any problems arise from this? Instead of expanding and necking back down to create a false shoulder.

Only tight neck chambers require neck turning.
Really nothing to do with fire forming other than
the loaded round would not fit into the chamber unless the necks are turned first.

This is true, but I will also add the step where you stop turning serves a purpose for fire forming as well. The step contacts the chamber where the neck starts to headspace off of.

I disagree with you there ridge, the false shoulder is what supports the case during firing not where you stop turning. If it needed that step where you stop neck turning then there couldn't be any no turn neck dashers, plus I fireform unturned brass with COW then neck turn them for a .268 nk barrel

I will bet anything they are short,uniform blow length is the important…….. very important. I seek and get a length of 1.550- 1.553 and i use a 1.564 chamber…………. jim

jim,
How do you achieve this?
I am forming dry with stiff load and 80 gn pills, and only getting 1.530"-1.533
are you using the heavy 105gn projectiles?

 

[johara1]

I use 115 Bergers for fire forming and i also use 108's , Varget and fed primers. Cleaned chamber and cases with non chlorinated brake cleaner and don't let them get hot……. jim

 

[highlife]

I use 115 Bergers for fire forming and i also use 108's , Varget and fed primers. Cleaned chamber and cases with non chlorinated brake cleaner and don't let them get hot……. jim

Jim
Do you think it's the 115 & 108 bullets helping with achieving the lengths you are getting?
Or just a combination with the dry chamber?
Richard

 

[Charles]

I used Jim's receipe with 30.0 of varget and 105 bergers and cut the neck down .250 got 1.554 to 1.558

 

[johara1]

I use 115 Bergers for fire forming and i also use 108's , Varget and fed primers. Cleaned chamber and cases with non chlorinated brake cleaner and don't let them get hot……. jim

Jim
Do you think it's the 115 & 108 bullets helping with achieving the lengths you are getting?
Or just a combination with the dry chamber?
Richard

The reason i use them is they don't shoot that good but they FF. good and i use less powder with the heavy bullets plus the long bearing surface backs up where i stop the neck turner to hold the case from stretching……… jim