Resized brass to a 6x45 and have a doughnut...

Ask questions and share information about reloading.
Post Reply
toasty
Junior Member
Posts: 95
Joined: Thu Apr 18, 2013 3:01 pm
.204 Ruger Guns: Savage 16

Resized brass to a 6x45 and have a doughnut...

Post by toasty »

So I finished building a 6x45 and am having a tough time finding a really accurate load. I bought some new lapua 223 brass and using a redding die, expanded the neck of the case to 6mm. After firing the rounds 1 time I have a pretty big doughnut inside at the base of the neck that is located where the shoulder was expanded into the 6mm neck. It will not let a bullet pass through on a 1x fired case. I can't imaging this doughnut not affecting accuracy. Thought about getting a reamer to remove it, but if I run the brass through a full length sizer, the doughnut is mostly gone. After full length sizing, the ID of my neck measures at .2425, but the ID at the location of the doughnut is .242. Do I need to worry about that .0005"? Any thoughts or opinions?
User avatar
Rick in Oregon
Moderator
Posts: 5180
Joined: Thu Dec 01, 2005 4:20 pm
.204 Ruger Guns: Sako 75V, Cooper MTV, Kimber 84M, Cust M700 11 Twist
Location: High Desert of Central Oregon
Contact:

Re: Resized brass to a 6x45 and have a doughnut...

Post by Rick in Oregon »

Yep, the donut is a fact of life when reforming/necking up/down. :?

K & M makes a tool specifically for removing this pesky issue, and it seems to be very well thought of among the accuracy crowd.

https://www.kmshooting.com/

As long as the bullet is not coming in contact with the portion of the neck that's harboring that .0005" bump, no worries. The amount of influence that will have on the burning characteristics of the powder will be minute.

HTH
Semper Fortis
Rick in Oregon
NRA Life/OHA/VHA/VVA

Oregon, East of the Cascades - Where Common Sense Still Prevails

Image
toasty
Junior Member
Posts: 95
Joined: Thu Apr 18, 2013 3:01 pm
.204 Ruger Guns: Savage 16

Re: Resized brass to a 6x45 and have a doughnut...

Post by toasty »

Thanks for the quick reply, I was hoping for an everything is good to go, but I had a feeling I was going to need to get me a reamer. Hopefully, that will shrink my groups down.
User avatar
RAMOS
Senior Member
Posts: 765
Joined: Sat Nov 21, 2009 9:30 am
.204 Ruger Guns: Savage Model 12 FLV, Cooper M21
Location: Sherman County, Oregon

Re: Resized brass to a 6x45 and have a doughnut...

Post by RAMOS »

When you size it, you move most of the doughnut to the outside. When you fire it, the chamber moves most of it to the inside. Best, just to get rid of the excess material. Inside reamer or outside clean-up, you can get good results either way. ;)
User avatar
Rick in Oregon
Moderator
Posts: 5180
Joined: Thu Dec 01, 2005 4:20 pm
.204 Ruger Guns: Sako 75V, Cooper MTV, Kimber 84M, Cust M700 11 Twist
Location: High Desert of Central Oregon
Contact:

Re: Resized brass to a 6x45 and have a doughnut...

Post by Rick in Oregon »

RAMOS wrote:Inside reamer or outside clean-up, you can get good results either way. ;)
Jon's right, and IMO, the best/easiest method is just to do a clean-up outside neck turn after sizing with the expander button in the neck die. Wha-la, no donut. ;)
Semper Fortis
Rick in Oregon
NRA Life/OHA/VHA/VVA

Oregon, East of the Cascades - Where Common Sense Still Prevails

Image
Fat Albert
New Member
Posts: 20
Joined: Thu Sep 29, 2016 2:20 pm
.204 Ruger Guns: none

Re: Resized brass to a 6x45 and have a doughnut...

Post by Fat Albert »

Cheapest and easiest way to get rid of them is to get a Forester "inside neck reamer'. You will need a Forester case trimer. You put it on trimer and run it into a fired and unseized case. This should be a one time thing. Midway sells them for $24.50
Post Reply