Re: full or neck plz help
The chamber is larger than the cartridge. Has to be for the cartridge to load.
When you fire, the brass expands to completely fill the chamber. Then it slightly contracts.
When you full-length resize, you squeeze the brass back down to factory spec.
When you neck size, you only squeeze the neck down. The rest of the case is still the same size as the chamber.
This gives you more accuracy, generally, but there are problems.
First, you need a very solid chamber when you fire. That means either a bolt or a single shot. Automatics, levers and pumps have enough give in the action that the case will actually be bigger than the "at rest" action.
Second, it will only fit in THAT gun. You fired it in THAT 1903 Springfield. This other 1903 Springfield might have a slightly smaller chamber, and your neck-sized round won't fit. Same with this Remington 700, or this Savage 110. If you fire it in gun #1 and neck-size it, the odds are it will not chamber in gun #2.
For target ammo it is great, but for hunting ammo you want to make sure that if chambers, no matter what. Full-length resizing will chamber in any gun of that caliber, and will chamber in dirty chambers.
So, if you have only one gun in that caliber, and it is a bolt or a single shot, and you are going to use it primarily for paper-punching, then I'd suggest neck sizing.
If you have multiple guns in that caliber, or you have a lever/pump/auto or you are going to use it for hunting, I'd suggest full length sizing.
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