Decapping military 5.56 and 7.72 Brass. Consumptive?

[seadog]

Let me get to a computer in the next day or so and I will post the spreadsheets

[Airgator0470]

Let me get to a computer in the next day or so and I will post the spreadsheets

So.... you ARE saying there is a difference in measurements of the BRASS?

OK... because if you have something other than what's cited above, I'd like to see it AND the source.

[seadog]

That's exactly what I'm saying . If you give me a moment I'll see if rumbler can post it

[Airgator0470]

That's exactly what I'm saying . If you give me a moment I'll see if rumbler can post it

At one time I had a drawing that indicated a .002 (or something really small) only in the neck length IIRC. Can't find it...

[seadog]

I'll bite.
Base diameter 223. 0.3760 . 5.56 0.3780
Shoulder diameter. 223..3553 . 5.56 0.3560
Neck-2/Case Mouth. .223 0.2540 5.56 0.2550
Freebore diameter. 223 0.2245 5.56 0.2270
Base-to-case mouth. .223 1.7720 5.56 1.7750
Base to shoulder. .223 1.2340. 5.56. 1.2380
Neck length. .223 0.2200. 5.56. 0.2180
Freebore length. .223. 0.0250. 5.56. 0.0500

The throat angle is also off by 0.6 degrees

[seadog]

I'll bite.
Base diameter 223. 0.3760 . 5.56 0.3780
Shoulder diameter. 223..3553 . 5.56 0.3560
Neck-2/Case Mouth. .223 0.2540 5.56 0.2550
Freebore diameter. 223 0.2245 5.56 0.2270
Base-to-case mouth. .223 1.7720 5.56 1.7750
Base to shoulder. .223 1.2340. 5.56. 1.2380
Neck length. .223 0.2200. 5.56. 0.2180
Freebore length. .223. 0.0250. 5.56. 0.0500

The throat angle is also off by 0.6 degrees

[Airgator0470]

I'll bite.
Base diameter 223. 0.3760 . 5.56 0.3780
Shoulder diameter. 223..3553 . 5.56 0.3560
Neck-2/Case Mouth. .223 0.2540 5.56 0.2550
Freebore diameter. 223 0.2245 5.56 0.2270
Base-to-case mouth. .223 1.7720 5.56 1.7750
Base to shoulder. .223 1.2340. 5.56. 1.2380
Neck length. .223 0.2200. 5.56. 0.2180
Freebore length. .223. 0.0250. 5.56. 0.0500

The throat angle is also off by 0.6 degrees

Uhh.... excuse me Sir... those are CHAMBER specs, I posted those and gave them to Rumbler some time back.

BRASS... the question was whether or not there was a difference in BRASS not the CHAMBER...lol.

Other than minimal case wall thickness... .223 Rem cases and 5.56 NATO cases are identical, only the CHAMBERS and load pressures are different.

You had me thinking I was about to learn something...