As I mentioned in my earlier post, I picked up 4 unfired rounds stamped: W.R.A.CO., U.M.C., D.D.CO.,and an unmarked one Friday night. The fellow I talked to indicated that the unstamped one is likely the oldest as they were issued in the 1880's. He also mentioned that the DCCO ones without the 99 and 00 that Rattlesnake Jack refers to are older than 1899.
I have measured them and the fired round. I measured;
W=base to top of rim (Rim thickness),
X= base to shoulder,
Y= base to bottom of neck,
Z=base to top of neck (overall length of brass) and
OAL of complete round.
I also measured;
A= the diameter of the rim,
B= diameter of the base (at the rim),
C= diameter at the shoulder,
D= diameter at the base of the neck and
E= diameter at the top of the neck (not the crimp).
I have also included the measurements from the technical diagram in Rattlesnake Jack's post above for reference. (I'm going to have to learn how to properly post a table sometime)
W X Y Z A B C D E OAL
UMC .0585 1.073 1.307 1.853 .6195 .558 .543 .481 .477 2.240
WRA .059 1.076 1.262 1.881 .626 .562 .548 .479 .474 2.268
DCC .061 1.071 1.261 1.878 .621 .561 .540 .478 .478 2.248
Unst .057 1.100 1.281 1.858 .626 562 .543 .482 .482 2.236
Fired .059 1.087 1.293 1.881 .623 561 .548 .481 .477 ---
Tech1 .058 1.038 1.338 1.880 .620 562 .549 .481 .472 ---
Tech2 .062 1.042 1.342 1.885 .629 564 .551 .4832 .476 ---
(By the way there is an error in the dimensions on the 45/75 diagram in Jack's post. The diameter at the base of the neck is probably .481-.4832 and not .581-.5832.)
And here are the pictures of the four complete rounds.
I suspect that the unstamped one has been reloaded. There is a distinct bulge on one side at the base of the bullet that you may be able to see in the picture.
The base of the unstamped one and the DCCO one are rounded. The edges of the rim on the DCCO and the WRA are square whereas the rims of the other two have a slight angle.
Hope this is useful
Icebox