Doughnut

[JohnJ]

Hey there guys... iv got a question for you...I'm not new to reloading but I'm new to using the bushing dies...currently I'm resizing the neck down to just about the shoulder and now i know what a "doughnut" is. now for the question

I would like to size the neck down to where the base of the bullet stops in the neck....will this cause a "doughnut" to form where the sizing stops in the neck....or should i resize the neck lower than where the bullet stops...the bullets are both BT and FB

thanks

JohnJ

 

[tightneck]

Doughnuts wont form from only sizing part of the neck. They
form from improper neck turning for a tight neck chamber,not cutting deep enough into the shoulder) and also from necking brass up to another caliber. For instance, forming 30 BR brass from 6 BR brass will create a doughut because in the process of expanding the necks, a portion of the shoulder becomes the base of the neck, and the shoulder is thicker than the necks.

 

[Kodiak99317]

Get an inside reamer and cut 'em out.

And I also agree with tightneck, you have to kiss the shoulder when neck turning or you will have a doughnut for sure, even with the true brass sizes i.e., 6PPC to .262 NK 6PPC or 22BR to .243 NK 22BR. The best neck turners are ground so you can get up to the shoulder without cutting a square edge in the shoulder like my Hart cutter, it has a radius edge and so you can come right up and just kisses the shoulder.

When I resize with button dies, I dip the cleaned case in graphite first before do anything sizing to the case. The graphite allows you to easiler and quickly see how much of the neck your sizing. Also works great for FL sizing die setup. You can see when your about to just touch the shoulder. I size the neck down to about 1/8" from the shoulder with button dies.

You can also get some nasty doughnuts from sizing larger cases into smaller cases, i.e., 308 Lapua's into long 22BR's. Even sized, formed and neck turned correctly, in time and many firings,,even using custom straight line dies made on the same reamer so I know I was not over sizing the brass to make it flow, but I was hitting 'em hard enough to leave the brass name imprinted into the bolt face and I was well over 4000 fps with a 52g FB!! OUCH eh! I backed off from the load to around 3700, the gopher can't tell the difference ) this thick body brass will become neck brass and you have to cut the donut out and possibly re-neck turn again. I experimented some on my long 22BR by setting the cutter so I was almost thru the shoulder wall, any deeper on the setting and the neck was cut off, lost a few setting it up, but I had to know. You can fire the neck down the barrel if you cut too much off, again I know with this long 22BR!,It's a Rem take-off barrel so a good playing tool).