Thread: Doughnut issues

Righto. I have a wee issue that I dont think is major but I will put it to the other anal reloaders like me out there on the forum who can have some imput and maybe a soloution.
I have always used a Forster Bonanza press and use Redding type 's' bushing dies. Others that use the Redding bushing dies know that when when FL or neck sizing they can in some instances leave a wee doughnut at the shoulder junction. Not really considered a problem in standard cases.
I get them but they are very slight (hardly visable) on my 6.5-06 cases and it does not seem to be a problem concerning accuracy. Maybe it could get better without them?

My real concern is I am getting an AI cartridge and everything I have read, written buy successfull LR shooters using this cal is that they also normally use Redding type 's' dies. But because of the doughnut you get with the bushing dies, they have either had a die made to spec or used a lee collet die. The latter is of no use in a Bonanza press.
I have purchased the dies and they have already arrived prior to finding out about this potential problem.

A seated projectile in an unturned Lapua case is .294 in my 06 and I am assuming it will be close to the same in the new AI using Lapua brass. The reamer has a neck of .297 giving .003 clearance on unturned brass. I will most likely take .001 off the neck after neck wall and weight sorting.
Considering the case neck will expand on firing to .297 and settle around .296 essentially giving me a .001 clearance until sized. The concern for me is the base of the neck will still potentially be .296 if the die forms a doughnut after sizing.
I believe neck tension may be affected and worry but doubt the case could almost headspace on the base of neck and not the shoulder.
Do others think this is a worry or am I being pedantic. If it is a concern, short of buying a spec die (I will if I have to) I would appreciate any ideas how to get rid of them if I get the doughnuts.

Cheers in advance