Neck Turning for reformed cases?

[Seaweed02]

I need to ask some more advice from the ones who know. I plan on making my own 8x57mm Mauser ammo out of both 30-06 and 270 cases. So when I reform the bigger brass cases down to 8mm Mauser size, do I need to neck turn the cases? If so what tools do you recommend? Thanks in advance.

[manny]

Forster makes a neck turning tool you can use by hand which works pretty well. Honestly I wouldn’t waste the time or money on it unless your shooting with a scope or for high accuracy. As long as you keep to SAAMI brass maximum lengths I don’t think you’ll have any pressure problems.

[Seaweed02]

Thanks Man

Thanks again brother. I am worrying for nothing I guess. Or maybe I am just watching a few too many YouTube videos. I saw one where the guy said that because you are moving a thicker part of the case up to the neck area when you reform, you should neck turn the brass. But I am not shooting anything but a Mauser K98. So I should be OK without neck turning right? As far as accuracy goes, I have a scout scope on one of my Mausers so it would be nice to be able to be kind of accurate on that one. The other one is just plain iron sights.

[gunboat]

You might -- as you form the shorter case from the longer case you can get thicker brass at the neck --
Some folks prefer to ream the necks -
You will just have to measure your finished brass to see if reaming or turning is needed --
my tuppence

[manny]

It all comes down to personal preference I guess. Many people ream out and swage primer pockets, deburr flash holes, and sort brass by weight. Does it make a difference, If your shooting 500+yrds I guess it does, but for what most of us do, plink or shoot under 250yrs, I don’t experience a difference. Yeah, the brass may be thicker where you reform it, or it may not, depends on your manufacturer. As long as the round chambers without any resistance your doing it correctly. Brass will flow from thicker areas so its key to make sure you trim after firings, especially with moderate to heavy loads.

I love to shoot paper patched cast going about 1700-1900 fps, my kids were brought up on this load. I had a 11 year old weighing about 70 lbs shooting the 1903 offhand AND hitting a 10” gong consistently at 100 yrds.
Good Shooting.

[gunboat]

I think it can make a difference and not just to accuracy -
If the brass is too thick at the neck, how does it expand when fired ?
Brass varies, I make 250sav from other brass and military 06 quite often need to be reamed -- while 308 usually does not --
You really need to measure the final formed brass to see if it is required -
my tuppence

[Seaweed02]

Measurements

So what should the measurements be for a 8x58mm Mauser neck? How thick should it be before I would even need to worry about turning or reaming the neck? And what tools, or equipment would you guys recommend that I buy?

[JagerDog]

I think it can make a difference and not just to accuracy -
If the brass is too thick at the neck, how does it expand when fired ?
Brass varies, I make 250sav from other brass and military 06 quite often need to be reamed -- while 308 usually does not --
You really need to measure the final formed brass to see if it is required -
my tuppence

^^^^^this

[gunboat]

Measure the outside diameter of a case fired in your weapon --
Your finished formed case should be a bit smaller than that --
That is just quick ballpark check --
I prefer reaming but either is usually suitable for your needs -
If you have a forster type trimmer, turning tooling is possibly cheaper -

Edit --
seaweed
Got off my duff, went to the shop and checked the forster outside neck turner kit -
an unopened item laying there for the last millineum --
Anyroad --
The dimension you want for 8x57 outside neck diameter is 0.3493 + 0.000 and -0.008

my tuppence

[J-cat]

I have not done this particular conversion, but know that whenever you form a neck out a shoulder, the neck is likely going to be too thick.

Brass thickness varies by manufacturer. Win is usually the thinnest. It is also the lightest. If you want to avoid inside reaming, Win is prolly your best bet.