Neck turning for Dasher

[bricktop]

So I have a .269" neck dasher chamber, several hundred blue-box Lapua BR brass, and a shiny new 21st Century neck turning kit. I have to take off a thou or so total from the diameter. I know some that have had tighter necks have purposely turned down to where the neck would end to use it as a false shoulder for forming. Others just turn down to that point anyway and make a shoulder with an expander. Either way makes a discontinuity of brass thickness that may lead to donuts later on, correct?

Is there any reason not to turn down farther, moving this discontinuity somewhere where the middle of the blown-out shoulder will eventually be? Then the brass will have uniform thickness from the top of the neck down to probably somewhere in the shoulder.

Sound reasoning? Or stupid?

 

[johara1]

You won't get a donut, with.001 change in shoulder thickness. I would not even turn them till after you fire form. A Dasher doesn't grow that much after the second firing, If they come out short you may never trim.....jim

 

[tclaunch]

I do things a bit different and turn the whole neck as a BR and then false shoulder and fireform. I too was concerned of the donut forming.

 

[varminthunter1]

I use the false shoulder method for fire-forming ( crush fit ), and then neck turn cases just to kiss the neck/shoulder junction. I have had great success with no issues.

 

[johara1]

Donovan, Don't you think if you turn the neck to the shoulder as a BR. and turn the neck the second time into the shoulder of the formed Dasher the thinest part of the case would be the shoulder? Brass has to flow to get a donut ? After i trim after the second firing the next time will be right before the national. They just don't move so the donut is not an issue, unless they have head space induced by pushing the shoulder back too much......... jim

 

[bozo699]

I guess we all have our own way of doing it, I don't have a dasher any more, well I do but the barrel is in the safe, anyway I turn for my .269 6BRX and I turn .120 approx to a 95 %+ clean up, fire form, then inside ream and work up my load or practice with that brass and the next firing I take a final turn on the neck and I have exactly what I want for neck clearance, I usually do a skim turn one more time mid season, then the brass gets tossed into my varmint pile and I start all over again.
Wayne.

 

[bricktop]

Thanks gents. Think I will turn down to the BR neck like some of you fellas. I think, less chance of me messing anything up this way.

 

[jrm850]

I have Wilson and Whiddon Dies for my Dasher and neither bushing pushes all of the way down to the shoulder. If I were to fire form first, then try to neck size it would take a bigger cut below the point where the bushing sized, leaving a thinner section at the base of the neck. It seems logical to me that I either need to use an expander that will push the entire neck out to the same OD before turning or turn before fire forming. Am I on the right track?
I think for my next batch of brass, I am going to clean up the necks all of the way to the shoulder of the BR case and let that thickness difference fall in the middle of the new shoulder. I also hope that this might possibly help me get my cases a hair longer when forming.

 

[bozo699]

I have Wilson and Whiddon Dies for my Dasher and neither bushing pushes all of the way down to the shoulder. If I were to fire form first, then try to neck size it would take a bigger cut below the point where the bushing sized, leaving a thinner section at the base of the neck. It seems logical to me that I either need to use an expander that will push the entire neck out to the same OD before turning or turn before fire forming. Am I on the right track?
I think for my next batch of brass, I am going to clean up the necks all of the way to the shoulder of the BR case and let that thickness difference fall in the middle of the new shoulder. I also hope that this might possibly help me get my cases a hair longer when forming.

No the bushing dies will not size the whole neck, the Forster bushing die comes the closest for me, I usually like to have a std. neck die honed to exactly the dimensions I need.
Wayne.

 

[SDDasher]

I guess we all have our own way of doing it, I don't have a dasher any more, well I do but the barrel is in the safe, anyway I turn for my .269 6BRX and I turn .120 approx to a 95 %+ clean up, fire form, then inside ream and work up my load or practice with that brass and the next firing I take a final turn on the neck and I have exactly what I want for neck clearance, I usually do a skim turn one more time mid season, then the brass gets tossed into my varmint pile and I start all over again.
Wayne.

Wayne:
I am up against the same issue with a big regional comming up in a few weeks and was wanting to clean up my necks some and found my neck tension changed when I cleaned up a few "extra" pieces I keep in case of any emergency during the match. Does your clean up have any impact on your neck tension; causing you to have to use a smaller bushing?

 

[Frankr]

I have that .2704 neck dia. I was told and have even seen prints that say min clearence no turn neck for new blue box brass. well That is not the caes at all. after fireforming i found i am going to have to turn them. so i had to come up with a way to do it. I cleaned and annealed them. used a .266 neck bushing,my K&M expander iron in the press, remove the expander iron from the die body, case in the shell holder, pushed the bushing to the shoulder,bushing againest the bottom of the expander die. Put the case with the bushing on it in the case holder chucked in a drill. used a pair of channel locks to turn the bushing and remove it from the neck, lol.. stick the expander iron back in. run the case on it. neck turned. I found the necks were slightly thicker tward the shoulder. Im kind of glad it worked out this way. i feel i have perfect turned necks. but it really sucked doing it this way. They are in the sonic cleaner now..yea.. 30 of them...I have 66 more to do,, Im going to see how they work out before i do anymore. I dont like doing them.

 

[bozo699]

I guess we all have our own way of doing it, I don't have a dasher any more, well I do but the barrel is in the safe, anyway I turn for my .269 6BRX and I turn .120 approx to a 95 %+ clean up, fire form, then inside ream and work up my load or practice with that brass and the next firing I take a final turn on the neck and I have exactly what I want for neck clearance, I usually do a skim turn one more time mid season, then the brass gets tossed into my varmint pile and I start all over again.
Wayne.

Wayne:
I am up against the same issue with a big regional comming up in a few weeks and was wanting to clean up my necks some and found my neck tension changed when I cleaned up a few "extra" pieces I keep in case of any emergency during the match. Does your clean up have any impact on your neck tension; causing you to have to use a smaller bushing?

6brmrshtr,
I have different neck turners for each rifle so once I get the neck thickness I want I never change the turner I just buy another turner if I need to do another rifle, with that being said when I do a mid season turn I do it with the same cut as I took the last time so not much comes off usually but if you change something there is a opposite reaction, I would have to say sometimes yes and sometimes no, it would just depend. I have changed recently some of my tactics, I have switched over to the K&M arbor press with force seat attachment on it and I look for a particular number, now that I am doing that I would probaby say most of the time there would require some change in the process, hope that helped some.
Wayne.

 

[johara1]

Wayne, As you get older you learn...... You are going in the right direction........ jim

 

[SDDasher]

Thanks Wayne, that helps and if Jim says you are going in the right direction, I would say "stay the course!" Thanks again.