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How to tell if brass has been neck sized or full length?

How to tell if primed brass has been neck sized or full length?

I bought a single shot target rifle that came with 80 pre-primed cases. The cases came sorted by weight and carefully marked on the boxes with the date they were fired and other notes. The previous owner was very meticulous, but I don't have access to him to ask. The only cases I already have in that size to compare them to to are also already fire formed in another rifle and neck sized. Is there a simple measuerment I can take that will give me an indication?

COAL is not an issue since this ammo will be used exclusively in this rifle, and is is a single shot action. I just don't want to put a lot of effort into working up a load in FL sized brass, only to have to tweak it later. I plan on only neck sizing going foward. The fire formed ammo I had from another rifle chambered without issue and fired nice groups. It is .001" off the lands in both guns, so I expect the load development to go quickly.

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Not really, the best way is

Not really, the best way is to just see if they will chamber in the rilfe.  Since they have been shot in that one rifle odds are that they are just necked sized or have had the shoulder just bumped enough to allow the action to close on the case. 

You might also want to check your other brass in the chamber of the new rifle if that is the one that you intend to shoot them in and make sure that they will chamber before you prime them. 

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Thanks for your reply. I am

Thanks for your reply. I am pretty sure this is neck sized brass. It is visually identical to my neck sized brass for the other gun, and the water capacity is 92.5 grains vs the published average of 88 for new brass. This is 300 win mag remington brass.

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Thanks for your reply. I am

Thanks for your reply. I am pretty sure this is neck sized brass. It is visually identical to my neck sized brass for the other gun, and the water capacity is 92.5 grains vs the published average of 88 for new brass. This is 300 win mag remington brass.

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