Inside or Outside

Schnyd112 · Oct 19, 2018

WildRose said:
You're making sense but I keep returning to the fact that we work the brass from the outside thus pushing the eccentricities to the inside.

I've inspected thousands and thousands of rounds of new and X fired brass over the years and often see the thinning on the inside rather than the outside. With those cases if we're only milling the outside rather than the inside we will quickly reach a point where it's so thin in places it's no longer serviceable.

Remove it from the inside and there's far more material left for more firings. That at least seems to make the most sense to me.

I do appreciate all the help here but sometimes I just have to go ahead and put my hands on things and screw a few up before it all makes sense. HA!

Also remember you will probably only ever neck turn a piece of brass once so you aren't constantly cutting away brass from that spot.

WildRose · Oct 19, 2018

Schnyd112 said:
Also remember you will probably only ever neck turn a piece of brass once so you aren't constantly cutting away brass from that spot.

Hopefully. My main worry is the new brass of course but if I keep my loads reasonable I'm getting as many as 10 reloads or more in some cases and those necks will grow/thin in places eventually.

Good point though.

woods · Oct 21, 2018

I have the ability to substitute the Forster reamer for the inside turning mandrel and outside turn and ream at the same time

That being said, I much prefer to outside neck turn only because inside reaming really boogers up the inside of the neck

You should outside turn new brass and turn a little into the shoulder as Schnyd112 mentioned

You should keep in mind that turning or reaming will not accomplish all that you need to in regards to reducing runout or aligning the neck with the case body

That happens in the chamber on the first fire forming after you have neck turned to a consistent thickness

DUSTY NOGGIN · Feb 4, 2019

Thanks wood , i been looking for that illustration

Kmccord · Feb 4, 2019

WildRose said:
Help with neck trimming.

I'm going to have to purchase a good bit of 7LRM brass or else neck down my own .375 Ruger brass to make my own for the 6.5LRM.

Any way I do it, this will require neck turning.

As I look more and more into it I'm torn as it's looking like outside turning is the most common method with the inside reaming being the more precise.

Any downside to the internal reaming vs external trimming?

Thanks.

I had always understood inside neck reaming was to remove donuts, and outside neck turning is for uniform wall thickness. I am going to be in the process of purchasing a Neck reamer, and was looking at K&M, my 28 Nosler cases have donuts. I also need to start looking at annealing as well.

Inside or Outside

Schnyd112

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WildRose

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woods

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DUSTY NOGGIN

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Kmccord

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