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see if this helps
Well let me give you all the information needed and you answer the question. All ammo and guns have to make to a standard size so they will in turn function in each other. Just think of all the different combinations you could come up with. Just think of the number of ammo manufactures, reloading dies and gun makers you could think of. You could have a Remington gun and be shooting Winchester ammo or vise versa. A standard is set forth by the SAMMI. (small arms munitions manufactures institute) So all ammo, reloading dies and guns in a specific caliber are made to a specific size. Sounds good so fare. So you’re in the back yard and load up a few rounds and send them down range now what. You pick up your fired brass and head for the basement to reload them. You ask Dave if its all the same size why do I have to run threw my dies, good point. The chamber area of your gun is just a few 1000’s of an inch larger than the ammo to let the brass open up and release the bullet. If it wasn’t than you would have over pressure in the chamber. Ok here where it gets confusing. If your firing a bolt action or single shot gun the stays in the gun after firing until you remove it by working the action, so with that the brass conforms to the chamber size. If your firing a semi auto or full auto gun the brass is immediate extracted out of the chamber AND continues to expand as it cools. Now lets talk about what type dies are out there. You have full length sizing, neck sizing, seating die and crimp die. Well all dies sets come with a sitting die that just pushes the bullet down into place in the mouth of the brass, that’s cut and dry. A crimp dies, crimps the bullet in the brass once the bullet is seated, it just rolls the brass in just a little to better hold the bullet. This is seen in military calibers (.223/5.56, .308/7.62 nato, 30.06, 7.62x39) because they are fired in semi and full auto guns, the round flying in to the chamber at a high rate of speed, the crimping prevents the bullets from flying forward once the round stops in the chamber. That takes care of the seating and crimp dies. Now the sizing die. So with all this if you fire your ammo in a bolt action or single shot gun all you really need to do is size the neck area down to hold a bullet. (this a neck die) If you fire your ammo in a semi or full auto gun. The brass will need to be full length sized. Both dies will have a de-caping rod and expander ( pushes the primer out and opens the neck up after it goes in to the die, why you feel resistances as the brass comes out of the die) So with all this your shooting a AR-15 just buy the two die set, standard full length sizing die and seating die, you don’t need a neck die. Sorry to be so long winded but just didn’t want to answer the question but leave you with an understanding of whats going on.
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