Originally Posted by MagnumManiac
What planet are you from?
I have just done exactly what you said,this is about number 2000,because I check every die set I buy to make sure I get the neck tension i'm after.
RCBS 300WM Neck die with expander installed,neck measures .331" exactly.Expander removed,neck measures .3295".
Expander ball diameter measures .306" exactly,what I polished it to.
You do the math!
Well, last time I checked, I called Earth home but I'm glad another newbie was brave enough to come on here and act like this site was 24 hour campfire or something and let me know I'm seriously displaced from home.
A bit of advice for you mr maniac, this site has respectable people on it who come here to get away from sites like accurate reloader and 24 hour campfire. There is no need to try and start fights. ANd if you DO try and start fights, it might help you to find out who you are fighting with before you fire the first shot and make sure you have some ammo to fire with.
You measured two dies that happened to be ok. However, you must know that brass neck thickness will determine your neck tension in any die. Therefore, you either have thin brass, a good pair of dies, or both. Die manufacturers know that every brand and lot of brass has different dimensions and therefore must design their dies to handle it all. The only way to do this is make the neck sizing portion very undersized for the caliber. This ensures that everyones brass will be sized. Your 338 mag die will absolutely size your brass to a different dimension than it will my brass. And my 338 die will probably not even touch your brass from the dimensions you gave me and it would be worthless to you. Like I said, I have dies that squeeze down the necks so far that I HAVE TO neck turn to use them or the concentricity is horrid. But if I turn them down too far, then they won't size at all.
THis is the whole reason that bushing dies were invented and I was merely trying to explain this to the thread starter. ANd I do know how to work a caliper by the way. I use two every day!