Necking up cases and donuts

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superx10
Posts: 42
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: 90
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: 757
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


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