Newbie to 6 PPC Fire forming question

[KYStgtshooter]

Hello all,
I am a newbie to the 6 PPC and Fire forming new Lapua 220 Russian brass.
I picked up a used 6 PPC with a .262 neck. chamber.
The previous owner was gratuitous enough and included some brass, load data that was working and some extras to get me started.
Reviewing the different methods to Fire form new Lapua 220 to 6 PPC I decided I would like to try some loads Fire form with bullet.
Brass prep:
Sort, expand to .243, initially trim neck OD 1/2 of final cut, second trim to final OD .258 and checked in chamber that the bolt was happy to close.
Next up, I loaded up a dummy to match up the one the previous owner supplied. I used a Berger 68 FB and seated close to OAL spec. and verified neck OD chamber friendly.259 and then went to chamber/bore bullet seating work throat to ogive dimension and landed with a light into lands seating depth.
Again my intent is to result with a brass initial Fire form combination so, in with 27 grains of N133, 68 FB Berger light into the lands and send it off.
Measuring the brass dimension results come to exactly what I was expecting and moving to work to determine neck sizing bushings to begin with I noted inserting a bullet what I believe to be the “donut” inside the case neck and shoulder junction.
Looking for advise from here...
I have read some information on the donut but do I need to begin here to address?
I have a standard .243 inside neck reamer, but with the already trim down neck wall thickness reduction think this would be detrimental unless there is maybe an available “undersize” inside reamer for this?
I am open to advise from here.
Many thanks.

 

[caihlen]

Looks like you’re ready to go shoot em to me. More experienced hands should jump in.

 

[KYStgtshooter]

One additional add.
If I just go ahead and push through with my Sinclair.243 expander to address is this the correct route to go? Suggestions maintaining the donut.
Thanks again.

 

[alf]

Run the expander back in the neck, push the donut to the outside, and neck turn again to turn it off.

Back when I shot PPC's, I set the headspace on the virgin Russian brass, and fireformed it in 22 form.

 

[KYStgtshooter]

Thank you alf,
I didn’t mention but when turning down the neck I did turn slightly “into the shoulder” to attempt to address. Just wanted to include that info before someone jumps there.

 

[KYStgtshooter]

Further contemplation...
I can’t recall where but somewhere I was thinking it was advised against running an expander back though to iron out the donut. Can’t recall for the life of me where?
This was why my first thought was an undersized inside reamer maybe recommend.
Did I answer my own question by adjusting my neck to shoulder “cut in” or “stay further away from” adjusting neck junction trim depth to minimize the donut?
Would I be wasting time and brass going this avenue?

 

[jackieschmidt]

I would venture a guess that 99% of the 6 PPC shooters using regular 65/68 grain bullets consider the “donut” a non issue. The bullet base simply does not get any where near it If you have a throat more than .040 deep.

 

[Dub]

The only step I did not see you mention was trimming to length (1.494) which I would do after reaming to 6mm and before neck cutting.

 

[dgeesaman]

The only step I did not see you mention was trimming to length (1.494) which I would do after reaming to 6mm and before neck cutting.

Not to go off topic but my 6ppc brass formed from Lapua is only 1.485 long. I never did get mine to reach normal trim lengths.

 

[Ccrider]

The only step I did not see you mention was trimming to length (1.494) which I would do after reaming to 6mm and before neck cutting.

Normally, your fireform loads will be shorter than or right at 1.490.

 

[rayporter]

for years my cutter was set on 1.494 and never missed a case. then a few years ago the brass really changed. now set at 1.490 i will miss one now and then