- Thread starter jkonzal
- Start date
If your desired neck diameter is smaller than the expander ball, then it is not gonna work. Of course, I am talking about the inside diameter of the case in regards to the expander ball. I only use the expander ball with a large bushing in a neck die as a step down size. For example, with 308, if my case blows out to 343, I use a 341 bushing with the expander ball to get the mouth nice and round. I then use the F/L die without the ball with a 336 or 337 bushing. The expander ball will rip the mouth open larger than 336 or 337 if I used it with those bushings, so I don't use it with them.
If you have the right size bushing, the expander ball will likely have no effect.
M
milo 2.0
Guest
In the die box, there should be a black decapping pin holder, smaller in diameter than the expander ball, most use it. Try this, run a case up in die with the exp ball, then measure outside neck diameter, does it equal bushing size? Now put the black retainer on, run a case up in the die, then measure the same. Which one is closest to the diameter of the bushing you selected?
To get the desired neck tension from the bushing you chose, you don't want to run the exp ball.
To get the desired neck tension from the bushing you chose, you don't want to run the exp ball.
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I take the expander ball out and put it in the box and then I use one of these. 3/8" Expander Die Body
Also I use a universal decapping tool.
Also I use a universal decapping tool.
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M
milo 2.0
Guest
What do you use that thing for?
After FL resizing, you use to expand the neck's instead of the ball.
M
milo 2.0
Guest
Those expanders are the diameter of that caliber bullet, by running a case into what you have, you've essentially seated a bullet and then pulled it, you've lost your neck tension???????????????
I don't know about those specific ones, but other mandrels run .002" to .003" under bullet diameter. It would actually give you good neck tension if that is the case. If you don't neck turn it could give you more consistent neck tension, but if you do, there wouldn't be a point if you're using the correct size bushing.
M
milo 2.0
Guest
My 2- 21st Century ones are .0005 under caliber. These things are built for neck turning, I can't see the value of going 2-3 thou under, it's getting away from chamber "angles", for lack of correct term. I guess the cutting mandrel would have to match also, or you're going to bind when trying to neck turn.
Sorry I hijacked the thread!
I just checked and it's .001" to .002" smaller. These are Sinclair expanders. The larger one to expand and the smaller one to turn necks on. Relating back to the OP, if you neck turn I wouldn't use the expander, if you don't neck turn I would. But that's just one guys opinion.
I do not turn neck's, unless I have to, so far this has given me the best results and my run out is under .001 99% of the time.
As far as neck tension is right on the money, you can also have them made to any size you want.
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