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13

The results obtained in testing at 600 and 200 yards are shown in

the following tabulations:

Test of ball cartridges, caliber 30, model of 1906, manufactured specially for national match.

600 Yarns. Wind 7 to 8 o'clock, 3 to 7 miles. T Mean loilo & arget ean ve vertica rou Rifle and ammunition. So ro, o' 'o."mo. tion. tion.

Inches. Inches. Inches. Inches. 1-1 6.07 4.68 22.4 22.50 1-2 5. 03 3.01 13. 15 18. 70 1–3 4.85 2 18 12.00 18.95

1-4 5. 12 2.40 11.05 15.7 Loader No. 47---------------------- - 1-5 5.65 4.97 21. 10 21.90 Mean----------- ------------------------- 5. 34 3.45 15.94 19.55 Rifle No. 1094418–S.................. 1-6 T 5.4s T4.54 T15.65 T16.30 Lot No. 554............... 1-7 6.05 4. 14 16.70 17.65 Date of loading, June 16, 1919 1-8 4. 72 2.56 10.00 12.40 Machine No. 6............. 1-9 5.25 3.32 15. 70 21.30 Loader No. 38...............----- --- 1-10 4.97 3.96 18.55 18.55 Mean----------------------------------- 5.29 || 3.70 || 15.32 17.24 Rifle No. 386836–RI................. - 1–11 5.96 4.00 16.15 17.50 Lot No. 512----------------- 1-12 5.52 4. 16 17.10 17.40 Date of loading, June 16, 1919. 1–13 4. 74 3.42 12.80 14.65 Machine No. 10.............. 1-14 4. 14 3.04 12.70 13.45 Loader No. 206................------ 1-15 5.81 3.32 18.25 19.00 Mean--------------------------------- -- 5.23 3.59 15.40 16.40 Rifle No. 1092974–S.................. 1-16 4.56 1. 14 8.70 14.20 Lot No. 511................... - 1-17 3.77 2.08 8.00 10.00 Date of loading, June 14, 1919....... 1-18 4.14 2.76 13.70 15.00 Machine No. 10................ -- 1-19 6.36 4.46 18.10 19.00 Loader No. 206..... ----------------- 1-20 6.38 3.27 12.00 17.35 Mean-----.......... -------------------- 5.04 2.74 12.28 15. 11 Rifle No. 387723–RI......... ........s 1-2TT 6.23 T 1.3TT 16.05 T16.65 Lot No. 555.................. - - 1-22 6.38 3.21 11.60 16.95 Date of loading, June 17, 1919. 1-23 5.02 3.90 15. 20 15.70 Machine No. 6................. 1-24 5. 74 3.30 12.20 14.75 Loader No. 38.............. --------- 1–25 6.44 3.57 17.65 22.75 Mean.......................... --------- 5.97 3.64 14.66 17.36 Rifle No. 1094416–S.................. 2-1 4.65 2. 32 10.30 12.90 t No. 507............. ------- ----- 2–2 4. 70 3.06 9.65 12.75 Date of loading, June 10, 1919........ 2-3 3.62 2.4-2 12.05 12.25 e No. 9...... ----------------- 2-4 5. 52 3.11 11.35 18.40 Loader No. 47...... ----------------- 2-5 97 29 13.30 13. 40 Mean------- -------------- --------------- 4.49 2.84 11.33 13.94

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Test of ball cartridges, caliber .30, model of 1906, manufactured spe

cially for national match—Continued.

600 YARDS—Continued.

T M No. o g Target ean vertical vertica roup Rifle and ammunition. No. 1 radius. I devia- I devia- measure. tion. tion. Inches. Inches. l Inches. Inches. Rifle No. 380510-RI................. 2-6 4.64 3.18 15.9, 15.95 Lot No. 554...... ------------------- 2–7 3.18 1.88 6.25 11.15 Date of loading, June 16, 1919......., 2–s 4.48 3. 40 10.45 11.85 Machine No. 6..... ------------------ 2-9 6.88 4.07 20.35 21.80 Loader No. 38.................... --- 2–10 to. 57 4.00 14.40 17.30 Mean----------------------------------- 5.15 3.31 13.48 15.61 Rifle No. 1004311–S.................. T2-1T 3.16|| 4.22 T26, 15 T26.15 Lot No. 512...---------------------- 2-12 5. 12 2.84 14.00 16. 10 Date of loading, June 16, 1919........ 2–13 5.64 4.52 12.90 16. 10 Machine No. 10...................... 2–14 7.24 5.09 17.65 23.75 Loader No. 206...................... 2–15 4.79 2.83 17.20 17. 55 Mean----------- ------------------------- 5.59 3.90 17.58 19.93 Rifle No. 387597-R.I................. T2-16 |T4.10 T3.00 T 12.00 T 14.50 Lot No. 511......................... 2–17 4.93 2.78 9.50 17.50 Date of loading, June 14, 1919........ 2-18 4.63 2.15 9,20 15.75 Machine No. 10...................... 2–19 5.24 3.80 12.60 17.35 Loader No. 206....... --------------- 2-20 5.50 3.16 13.85 18.65 Mean-------------------------- [... 4.88 3.18 11.55 || 16.75 Rifle No. 1095.134–S.................. 2.2TIT5. To. 36 |T2.75 T13.35 Lot No. 555................. -------- 2–22 5.00 4.15 17.80 19.00 Date of loading, June 17, 1919........ 2–23 4.68 3.98 || 15.15 15.60 Machine No. 6....................... –24 4.62 3.24 18.25 18.60 loader No. 38....................... 2–25 5.2.1 3.04 18.40 1s. 40 Mean-------------------------. --------- 4.92 3.75 16.47 16.99 Grand average: Inches. Mean radius-------------------------------------------------------------. 5.19 Mean vertical deviation................................................... 3.41 Extreme vertical deviation............................................... 14.40 Vertical error------------------------------------------------------------- 8, 90 Group measure.------............................. ----------------------- 16, 89

15

Test of ball cartridges, caliber .30, model of 1906, manufactured specially

for national match—Continued.
200 YARDS.
Wind 7 o'clock, velocity 10 miles.
T M Yolo a

- arget ean vert vertica rou

Rifle and ammunition. No. 1 radius. ! devia- I devia- mo.
tion. tion.
Inches. Inches. Inches. Inches.

Risle No. 386836–RI................. 1-1 2.08 1.56 6, 15 to, wa)
Lot No. 512.------------------------ 1-2 1.48 .65 3.65 5.60
Date of loading, June 16, 1919........ 1-3 2.17 1.49 6.05 6.70
Machine No. 10..................... 1-4 ..ss . 64 2. 3.30
Loader No. 206 ---------- ---------- - 1-5 1. 62 1. 04 4. 55 4. so
Mean...-----------------------|--------- 1.64 1.07 4.66 5.45
Rifle No. 1094416–S.................. 1-6 T1.96 T102 T5...no | c.2)
Lot No. 554------------------------- 1-7 1.98 1.06 4,70 5.10
Date of loading, June 16, 1919........ 1-8 2.24 1.40 6, 50 6, 55
Machine No. 6....................... 1-9 1.82 1.56 6.05 6.10
Loader No. 38....................... 1-10 1.56 .63 2.95 5.35
Mean-...---------------------. --------- 1.91 1.13 5,04 5, 86
Rifle No.1092974–S........... -------- 2-1 T 1...ss T1.25 T5.65 TT 5.70
Lot No. 512-...--------------------- 2–2 1.44 1.20 4.15 5.50
fate of loading, jūneig, 1910........ 2–3 1.70 1.17 5.70 5.75
Machine No. 10......... ----------- -- -2-4 1.18 .43 1.95 4. on
Loader No. 206.-------------........ 2-5 1.69 1.36 5.15 5.45
Mean......--- ---------- ----------------- 1.58 1.08 4.52 5.44
Rifle No. 374653–RI................. 2-3 T 1.22 TT.63 T 2.45 T 4.2)
Lot No. 554......................... 2–7 1.31 . 92 3.75 4.45
Date of loading, June 16, 1919........ 2-8 1.93 1.22 4.80 5.40
Machine No. 6...--------------------. 2-9 1.48 .92 3.05 5, 15

Loader No. 38....................... 2-10 1.32 .77 3.30 4.
Mean....------------------------------- 1.45 .89 3.47 4.72
Grand av : Inches.
Mean radius----------------------------................................. - 1.64
Mean vertical deviation................................................... 1.04
Extreme vertical deviation...... -------------------- ------------ --------- 4.42
Vertical error---------------------------------------------------.......... 2.73

Group measure----------------------------------------------------------- 5.37

16

FINDINGS.

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The board finds as a result of the tests that the pistol ball cartridges, caliber .45, model of 1911, manufactured at Frankford Arsenal, Philadelphia, Pa., and specially selected for the national matches, gave the following accuracy: At 25 yards range:

Inches. Mean radius........

0.88 Mean vertical deviation..... Extreme vertical deviation...

2. 20 Vertical error........

1.38 Group measure......... At 50 yards range:

Mean radius..
Mean vertical deviation.......

1.21 Extreme vertical deviation.... Vertical error.................. ................ 2.92 Group measure...... The board is of the opinion that this ammunition is suitable for the purpose for which selected and recommends that it be issued for use in the national pistol match.

The board finds as a result of the tests that the ball cartridges, caliber .30, model of 1906, manufactured at Frankford Arsenal, Philadelphia, Pa., specially for the national matches, gave the following accuracy: At 200 yards range:

Inches. Mean radius....

1. 64 Mean vertical deviation.......

1.04
Extreme vertical deviation....
Vertical error.....
Group measure.

5. 37 At 600 yards range: Mean radius.

5.19 Mean vertical deviation.....

3. 41 Extreme vertical deviation...

14.40 Vertical error............... Group measure.........

16. 89

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17

At 1,000 yards range:

Inches. Mean radius........

9.65 Mean vertical deviation.....

6.99 Extreme vertical deviation...

28. 21 Vertical error.....

17.60 Group measure.....

30. 32 The board is of the opinion that this ammunition is suitable for the purpose for which manufactured and recommends that it be issued for use in the national individual match and the national team match.

The board finds that as a result of the tests of the ball cartridges, caliber .30, model of 1906, equally in United States rifles, caliber .30, model of 1906, manufactured at Springfield Armory and Rock Island Arsenal, that the 10 rifles of each of these makes tested show comparative accuracy as follows:

200 600 1,000 Rifles manufactured at Springfield Armory: yards. yards. yards. Mean radius.........

1.74 5.07 9.70 Mean vertical deviation.......

.. 1.10 3. 396.88 Extreme vertical deviation.....

.. 4. 78 14.60 28.73 Vertical error.

2. 94 8. 99 17.80 Group measure.....

..... 5.65 16.64 30.08

200 600 1,000 Rifles manufactured at Rock Island Arsenal: yards. yards. yards. Mean radius......

.... 1.54 5. 31 9.80 Mean vertical deviation........

.98 3.43 7.10 Extreme vertical deviation....

. 4.06 14. 2027. 69 Vertical error....

...... 2.52 8.32 17.39 Group measure

.. 5. 08 17. 13 30. 64 Based upon tho vertical error, these tests show at all ranges a very slight superiority in favor of rifles manufactured at Rock Island Arsenal. Based upon the mean radius, a slight superiority in rifles manufactured at Springfield Armory is shown. The board is of the opinion that no clean superiority of one make over the other is established in these tests, and recommends that both makes of rifleg be issued and used in the national matches. This finding is made at the request of the chief, small arms division, Ordnance Department.

The board is of the opinion that the measure of a group of shots, known as the mean radius, is not satisfactory in determining and comparing the accuracy of ammunition at mid and long ranges. The mean radius truthfully represents the accuracy of rifle and

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