Table of Ballistic Data, to Examine the Trans-sonic Variation in the Ballistic Coefficient,  'C '. Subject Projectile:     Howitzer Lead Round Nosed    9mm Parabellum Physical Data:                    Weight = 125 grains              Calibre = .355                           Form Factor = 1.2095         Derived Value of C = 0.1172
Chronograph Details:

Type:

Spacing: Location:
Initial 'V' Final 'v' Distance projectile travels between 'V' & 'v' velocity measurement.

50 feet

Indoors

Yes
ProChrono ProChrono Outdoors  
a b Altitude (feet above Sea Level)  
Venue: Lane 5, Stafford Post Office Club.

Test Data

Computation of Space Functions & Ballistic Coefficient ex American Ingalls' Tables

Retardation & Ballistic Coefficient ex British (1902-1909) Firing Data

Velocity

Initial Final Mean

S(V)

S(v)

S(v)-S(V)

C

R

( Retardation STD)

r

(retardation TEST)

C

1175 1123 1149 9268.8 9738.8 470 0.10638 129.388 1194.96 0.108278
1183 1137 1160 9203.7 9603.7 400 0.12500 137.304 1067.2 0.128658
1150 1103 1126.5 9493.2 9943.8 450.6 0.11096 113.74 1058.91 0.107413
1184 1135 1159.5 9203.7 9622.6 418.9 0.11936 137.05 1136.31 0.120610
1211 1160 1185.5 8989.1 9404.5 415.4 0.12037 152.901 1209.21 0.126447
1174 1124 1149 9285.3 9738.8 453.5 0.11025 129.301 1149 0.112534
1136 1095 1115.5 9622.6 10041 418.4 0.11950 106.583 914.71 0.116521
1146 1104 1125 9529.5 9943.8 414.3 0.12069 112.596 945 0.119149
1134 1091 1112.5 9641.6 10085.2 443.6 0.11271 104.813 956.75 0.109551
1148 1103 1125.5 9511.3 9943.8 432.5 0.11561 113.021 1012.95 0.111576
1185 1136 1160.5 9187.7 9622.6 434.9 0.11497 137.813 1137.29 0.121176
1199 1152 1175.5 9078.6 9475.2 396.6 0.12607 147.431 1104.97 0.133425
1148 1098 1123 9511.3 10008.3 497 0.10060 111.598 1123 0.099375
1183 1137 1160 9203.7 9603.7 400 0.12500 137.304 1067.2 0.128658
1203 1151 1177 9048.4 9475.2 426.8 0.11715 147.892 1224.08 0.120819
1174 1126 1150 9285.3 9719.1 433.8 0.11526 129.943 1104 0.117702
1196 1146 1171 9109.3 9529.5 420.2 0.11899 144.656 1171 0.123532
1182 1134 1158 9219.8 9641.6 421.8 0.11854 135.871 1111.68 0.122221
1189 1143 1166 9156 9547.9 391.9 0.12758 141.94 1072.72 0.132318
1180 1134 1157 9236 9641.6 405.6 0.12327 135.035 1064.44 0.126860
    0     0 ??      
    0     0 ??      

ACE/mjgba 2002 - ref. 9mmParaBallisticData2.wpd