Elarski,
One cartridge you might consider is the 6mm Remington Ackley Improved. Would fit well in your 98 Mauser with few, if any, problems. Just a thought.
Ol' John
Re: Darrel Holland\'s "Witches Brew"?
Good stuff--gets the last of the copper and fouling that Hoppe's and Shooter's Choice misses. Darrel puts out a quality product in every respect.
Ol' John
For neck sizing only, I have been using powdered graphite for better than 20 years and nary a problem. I bought my last bottle about 8 years ago at the local auto store. If I have to full-length size I use Hornaday's 'One Shot'. I still use it on my handgun cases that I don't have a carbide...