Thread: Necking down 308 to 7mm08

Originally Posted by RimfireNZ

Hey chaps.
So a friend in the US has sent me 1,000 rounds of 308 brass (once fired, fully resized and tumbled and ready to use). I'm going to be flicking some of them off... but I thought since some of my brass is getting a little tired, I'd like to have a crack at necking some of it down.

Now on another forum I'm on some of the guys reckon I can just neck them down and it's done. Others are talking about annealing the brass to make it last longer (which I've never done) and talking about reaming the neck.


Anyone here done it? Any of you seasoned reloaders got any tips?

Cheers guys.

Size a few down & check the neck diameter with a projectile in it against a "normal" one.

You should be GTG, another check is to make sure a projectile will fit easily into a fired case before it is sized.

If either of those don't measure up you will need to neck turn them, but if your rifle has a factory chamber that most likely won't be needed.

Originally Posted by Kiwi Greg

Size a few down & check the neck diameter with a projectile in it against a "normal" one.

You should be GTG, another check is to make sure a projectile will fit easily into a fired case before it is sized.

If either of those don't measure up you will need to neck turn them, but if your rifle has a factory chamber that most likely won't be needed.

Thanks KiwiGreg.
Beauty then. If all goes well with my testing I'm going to be swimming in ammo shortly