7.62x39 dies - how does the die make it .310 or .308?

[Ohio Rusty]

Rifle dies I know little or nothing about. When I size a pistol casing, it is sized one size.
The 7.62x39 can use either a .310/.311 boolit or a .308 boolit. How does the sizing die for that caliber select the correct neck for the boolit you want to load? Do you need to specify the neck size of the die ?? (thinking about Lee dies).
Ohio Rusty ><>

[mcnee229]

The decapping pin works double duty and acts a sizing punch to size the inside of the neck. The die pushes the neck smaller than the rod, and the rod when its pulled out brings the neck to the correct size.

There is nothing special about a rifle barrel, you need to size the projectile correctly for the bore.

ETA: If you need to make it smaller, you can turn down the rod to get the tension/diameter you need for your projectiles.

Scott

[gray wolf]

Some of the die sets come with two expander balls, one for .308 and one for .310

[runfiverun]

and rcbs sells all kinds of sizes of expander balls.
I am using a 3095 in my 308 set.

[badbob454]

my rcbs has a .309 and a .311 neck expander ball it is screwed on and off so i can use it according to my barrell internal size i oe=rdered a .313 to shoot .314 diam boolits no different than a 9mm luger to a 9 makarov less of a wall taper and a larger bullet expander ball

[lmfd20]

My die set came with a 308 and 311 expander. Loosen the collet, swap expander, tighten collet. Takes about 30 seconds. I believe I have lee dies for the 762x39 but I could be wrong. Have to go out in the garage and look.

[Ziptar]

The Sets come with different expander balls. This is the RCBS .308/.311 set.

66559

[MT Chambers]

The bushing sizer dies such as Redding use diff. sized bushings and no expander to give you a better choice of neck size and tension, this method is much smoother as the expander ball tends to drag, and possibly even stretch case necks on std. rifle dies.