Re: Brass question.
1. make sure the relief hole in the die is unobstructed. If the die can't relieve the trapped air when it sizes, it will cause deformities in the shoulder area.
Wax type lubes, if used in large quantities will clog the vent hole regularly, one reason I like One Shot. No clogging.
2. Use any case lube sparingly. Too much lube (which is thinly disguised release agent) will cause pressure pockets in the shoulder area and deform them.
We just had a discussion about case lubes on here. My preference (I'm a minority it appears) is Hornady One Shot in a ziplock bag with 50 cases or so. Make bread for a minute or two in the bag with a good shot of One Shot and take 'em out and let dry and then size.
Lots of guys on here like Imperial Sizing Wax. never tried that.