Necking up cases and donuts

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superx10
Posts: 60
Joined: Wed Aug 19, 2015 9:32 am

Necking up cases and donuts

#1 Postby superx10 » Mon Jan 07, 2019 4:43 pm

Hi
I am new to tight necks and necking up cases, I have just started shooting a 284 win in F open and naturally purchased Lapua 6.5 * 284 necked them up and turned the necks to suit a .312 diameter, on final inspection it appears that a donut has formed on the inside and at the intersection point of neck and champher . I have 7mm cutter that suits my K&M neck turner but was hoping for some information from some people with more experience, any input would be appreciated as I am sure with the amount of f open shooters who shoot the 284 win this has been dealt with often.
Thanks in advance

AlexE
Posts: 130
Joined: Fri Feb 16, 2018 9:18 am

Re: Necking up cases and donuts

#2 Postby AlexE » Mon Jan 07, 2019 9:32 pm

Like you've suggested, I use the k&m cutter pilot. No donuts. Used the same setup to create 260 brass from. 243 before good 260 brass became available

williada
Posts: 807
Joined: Wed Jul 22, 2009 12:37 am

Re: Necking up cases and donuts

#3 Postby williada » Mon Jan 07, 2019 10:39 pm

Richard Utting sums it up pretty well. https://www.youtube.com/watch?v=EyJ9KkE2pVc

Bigtravoz
Posts: 169
Joined: Sat Apr 22, 2017 7:43 pm

Re: Necking up cases and donuts

#4 Postby Bigtravoz » Sat Feb 23, 2019 8:58 pm

Might sound silly but wouldn’t reaming the internal of the neck solve the issue?

GSells
Posts: 449
Joined: Sun Aug 13, 2017 11:04 pm

Re: Necking up cases and donuts

#5 Postby GSells » Sat Feb 23, 2019 9:13 pm

superx10 wrote:Hi
I am new to tight necks and necking up cases, I have just started shooting a 284 win in F open and naturally purchased Lapua 6.5 * 284 necked them up and turned the necks to suit a .312 diameter, on final inspection it appears that a donut has formed on the inside and at the intersection point of neck and champher . I have 7mm cutter that suits my K&M neck turner but was hoping for some information from some people with more experience, any input would be appreciated as I am sure with the amount of f open shooters who shoot the 284 win this has been dealt with often.
Thanks in advance

Hi Scott , yes I’ve formed up cases from 6.5 284 . I can only say that my boat tail junction is above the donut and doesn’t pose a problem fo me . May have to throut out a bit more freebore ??

Bigtravoz
Posts: 169
Joined: Sat Apr 22, 2017 7:43 pm

Re: Necking up cases and donuts

#6 Postby Bigtravoz » Sat Feb 23, 2019 9:32 pm

williada wrote:Richard Utting sums it up pretty well. https://www.youtube.com/watch?v=EyJ9KkE2pVc


I love how he’s using the “so inaccurate” lee hand press that no one could ever produce accurate ammunition with. Lol

I love my lee hand press.


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