Doughnuts when necking up 300 rum to 338

[distantfoe]

I've ran into an issue when necking up 300 rum brass to 338 edge. There seems to be a slight doughnut at the neck shoulder junction. I've had similar circumstances occur and I simply necked the brass up another caliber and neck turned followed by necking back down, problem solved. Although in this case I'll have to purchase a large caliber neck turner.

The question, are there any more tricks to addressing the doughnut without purchasing a large cal turner, using neck reamers or seating longer? (c.o.a.l is already 3.9+)

 

[glo]

Not that I know of. The the longer the neck and the more your into the shoulder, the more meat you will incounter. It's just part of the drawing/extrusion process in making brass. :-\

 

[oinco]

interested to see which brass and expander you are using? I have had no donuts using Nosler brass and Hornady 338rum dies? I have not tried Remington brass yet.