Partial neck sizing and neck sizing dies question

[struff55]

does the dime work for this?

the dime is a guide line only
and not much of one
start by setting the die with a 1/8 " of the shell holder a dime ish resize a case and trie it in your rifle when it closes with a very slight amount of pressure o the case then you are good to go if you are shooting a semi or a pump then you will have to full length size

 

[bearhunter]

OP, instead of guessing, use a black felt marker to color the neck. Lube as usual and run the case into your die.

When the mandrel is up as far as it will go, pull the case out and look at the neck to see how far it's being sized.

Usually, unless you have a custom chamber, there will be a slight ridge on the base of the neck if you are only partially resizing

 

[Butcherbill]

Here’s a simple explanation to setting up your FL sizing die to shoulder bump. He does a .002” bump but your rifle may need more to allow the bolt to close.

 

[Leeper]

It depends on a few things; the shape of the case, the relationship between the size of the rifle chamber and the sizing die, the length of the neck. In a rifle chambered to minimum dimensions, in 303 British, a backed out FL sizer works great because there is plenty of body taper on the case. Under the same conditions the 30/06 is also fine and the 30/40 Krag or 30/30 Winchester are even better. The 243 Winchester sux because body taper is slight, the neck is short, and the shoulder has some slope to it. Although the body of the two cases are the same, the 308 is much better in this respect.
I set all of my FL dies to just bump the shoulder. I then use a .100 washer if I want to size only the neck. This works fine for all of the cartridges for which I load.
Most commercial neck sizing dies do not support the body of the case at all and will allow the sized neck to be off center. This is not conducive to improved accuracy.

 

[ghughes]

The 308win will have a slight case taper so it may need a little extra attention to adjust the die. Now the 7.62x39 should be straight forward due to the greater case taper. The 25-06 and maybe 222rem are in the middle ground I suspect. As I remember I just watched the neck buldge to travel down to the shoulder the stopped adjusting.

 

[guntech]

Maybe it depends on the dies?

I make a habit of sizing to just touch the shoulder on fired rounds from the same chamber.

I believe it takes at least .005 shoulder set back to completely full length resize.

If you push the shoulder back a half a thou or simply touch the shoulder the sized diameters of the neck and the body for all purposes will be the same... you are full length sizing the tapered portions of the case.