Partial Sizing of Bottlenecked Rifle Brass

Here's a way to get the benefits of neck sizing with your full length resizing die.

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Howto & Style

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• ammosmith
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• reloading

[fishblade2]

I messed this up. Here is the correct version: I know that the should will go up on the brass and you will have to use a FL sizing die to set it back some. I know that using a Fl like usual will you neck length but I don't know if it will effect your neck turning or neck sizing. Will it? But my main question is with this partial resizing technique will it mess up the neck trimming, turning or neck sizing that you have previously done?

[ammosmith]

@fishblade2 No..once the brass is trued up it's just a matter of your sizing technique. You won't need to trim as much but you will want to trim to a uniform length.

[winxpman02]

I have tried this with my FL sizing dies and it never works like the NS dies do. The neck sizing with FL dies only seems to go down about 1/2 way before engaging the case body. The NS dies can go all the way down with no issues.

[ammosmith]

@winxpman02 This is a method to be able to do more with what you've got. Partial sizing isn't used as much anymore with NS dies out there but it's a good skill you can use to your advantage.

[winxpman02]

@ammosmith I guess in this prospect it would make sense.

[ammosmith]

@winxpman02 I have some reloading books from the 1930's and 1940's that have tons of useful information...even today is applicable.

[SilntObsvr]

What I read when I was learning to reload (in 1981) was that attempting to partial size with a full length die was a bad idea. Why? Because what you're doing with this offset ring is failing to resize the bottom 1/8" of the case neck. Neck sizing with the correct die will size the neck all the way down to the shoulder, but do it without setting the shoulder back (increasing case life and accuracy).

[spritrocks]

I have a 300 savage that i would like to take out more often but for $30 a box of 20 i think twice. Would it be possible to resize .308 brass to .300 savage? Ive heard it can be done.

[fishblade2]

@ammosmith so just neck trimming will have to be done but not neck turning at all after you have neck turned once?

[fishblade2]

I have been researching some stuff and I read that every so often the neck will go up on the bullet and you have to use the FL sizing die to set it back some. I know that using a Fl like usual will effect your neck length but I don't know if it will effect you neck trimming. Will it? but my main question is if you want to just move the neck back some would this partial sizing technique be the thing to do because if it's going to mess up the neck turning and trimming anyway I don't know the solut