TABLE II
Uniformity of Antimony, Concentration Among Bullets Taken from Single
Boxes
No. of Bullets Antimony Concentration
Bullet Sampled from Std. Deviation
Caliber Make Box Avg. %w %w
0.38 Remington 10 0.85 +0.02
0.38 Western 10 2.59 +0.10
0.22 Lapua 50 1.22 (a) +0.04
0.22 Sears 20 1.26 (a) +0.03
0.22 Imperial 20 0.99 +0.04
0.22 Peters 20 0.87 +0.08
0.22 Remington 20 0.85 +0.04
(a) Also found: Sn: 1.04% in Lapua, 0.18% in Sears.
Al: 1.09 ppm in Lapua, 1.25 ppm in Sears.
Table III
Norma Norma
(Wire) (Wire) Remington Western
Sample Section I Section II (Bullet) (Bullet)
1 (outermost) 5140 5346 1142.1 1138
2 5721 5428 1069.6 1200
3 5363 5573 1149.8 1195
4 5235 5561 1085.5 1195
5 5500 5651 1155.1 1185
6 5359 5461 1162.1 1155
7 5545 5522 1162.1 1150
8 5681 (center) 5288 1108.4 1195
9 5700 1103.6 1163 (center)
10 5532 1139.1
11 5650 1078.5
12 5547 (center) 1124.2 (center)
Avg. 5450 5505 1123.2 1177.1
% of value +3.85 +2.50 + 2.85 +1.98
TABLE II Note the large numbers of bullets sampled from each box, as opposed to the 2-4 sampled by Guinn in his Mannlicher-Carcano tests. Note also the homogeneity of the antimony concentrations, as indicated by the low standard deviations, even when sample weight and not ppm is used in averaging.
TABLE III As many as twelve samples were taken from the cores of several bullets and bullet wires in these 1968 tests. Note that 12 fragments from a 0.38 caliber Western bullet varied only 62 ppm in antimony content. Other 0.38's showed similar figures. This is true homogeneity within a given bullet. Compare with Guinn's figures for "homogeneity" in Mannlicher bullets in Appendix C.
(from "Comparison of Bullet Lead Specimens by Nondestructive Neutron Activation Analysis." Journal of Forensic Sciences, Vol. 16, No.3, pp. 304-305)