I’m Turning Necks Now!

[DoneNOut]

Not because I'm just daggum handsome this time!

So, reducing 308 brass to 708 brass and then fire forming to 708 AI brass produced some thick necks at the tune of .016". With loaded bullet I had maybe .0005 neck to chamber clearance. Yup, about none. I experienced bughole grouping out of 708 cases being formed, then things went off the rails with my 708AI loads.

@VinceMule - suggested I had some weird donut or something forming in the cases when fired to AI.

Got my neck turning stuff and Vince was right. When I turn these necks, the mandrel gets stopped for a few seconds until it overcomes the anomaly present in all these case necks!

I'm down to .013" case neck thickness now with no weirdo bumps in the necks. Can't wait to see the results in target!

 

[GLTaylor]

Well done, and pretty!
You might want to go a hair further down and just touch the shoulder
Otherwise you'll likely get more/stouter donuts.

 

[DoneNOut]

Well done, and pretty!
You might want to go a hair further down and just touch the shoulder
Otherwise you'll likely get more/stouter donuts.

How much further into that shoulder you think? This?

 

[Beluebow]

I think your good...

This is where I take mine.

 

[DoneNOut]

I think your good...

This is where I take mine.

View attachment 484648

Thanks so much!

 

[K.E.C.]

I think if you neck up 260rem , you may not have that issue. But your chamber may be a tight one. Welcome to turning necks.
They are pretty.

 

[DoneNOut]

I think if you neck up 260rem , you may not have that issue. But your chamber may be a tight one. Welcome to turning necks.
They are pretty.

Oh yes Sir. I have the reamer and checked the specs. First time with a match reamer. Now I understand the numbers on the spec sheet! Lol

 

[ButterBean]

How much further into that shoulder you think? This?
View attachment 484646

You are good to go right there

 

[Welderboy11972]

Your necks look good. The only thing that I see, is the angle of the cutter. Is it the right angle for the AI?....Kinda asking and informing at the same time. I've never turned necks on a AI, so it might not matter.

 

[DoneNOut]

Your necks look good. The only thing that I see, is the angle of the cutter. Is it the right angle for the AI?....Kinda asking and informing at the same time. I've never turned necks on a AI, so it might not matter.

This is a 50 degree cutter. K&M said 50 degree cutter works for everything. AI is 40 degree. They offer a 43 degree cutter. Just not sure if it's worth it right now in my infancy stage of neck turning.

 

[GLTaylor]

Eventually you'll end up with a standard shoulder and AI shoulder cutter. Here's where one size may not fit all. You look fine!

 

[DoneNOut]

Hooking up a bud with identical barrel & reamer!
Please feel free to critique!

 

[ButterBean]

Hooking up a bud with identical barrel & reamer!
Please feel free to critique!

What case chuck are you using tere>

 

[DoneNOut]

What case chuck are you using tere>

That's a K&M chuck. It requires a Lee autoprime #2 shell holder for 308 based cartridges. I rednecked engineered the cinch tight mechanism with a Hornady die lock ring and saved $15.