Yesterday a friend and I spent a Day at the Shooting range with a Chronograph, here is the Report of our results:
Chronograph results of Load Testing on Tuesday August 16th 2016.
At “Angeles Shooting Ranges”.
Instrument used: ‘Shooting Chrony F1 Master’ with printer.
Test Firearm:
Ruger New Model Convertible Single Eight in 25ACP and .25ALRM Cartridge Chambering eight shot Revolver with 10-5/8” barrel (~12” Muzzle to Breech/Recoil Face.
Test Setup:
Positioned on “Handgun" Firing line in front of Permanent Target Frame about 5 yards from long Bench Type Firing line. Bench height about 38 inches.
A Stool was used for the Testing as a Seat for the ‘Shooter’.
Chronograph was Set up on a Tripod about 5 feet forward of the Firing Line. The Remote readout and printer were positioned on the Firing line bench.
The Printer and Chronograph were operated on Internal Batteries.
Altitude = ~ 1,680 feet Above Mean Sea Level, Temperature ~100 Degrees F.
Test Results:
Comparison run employing “Prvi Partisan” (PPU) Factory Loaded (Made in Serbia) .25ACP 50Grain FMJ-RN ammunition manufactured under CIP Regulations and Controls.
Technical Information
· Caliber: 25 ACP
· Bullet Weight: 50 Grains
· Bullet Style: Full Metal Jacket
· Case Type: Brass
Ballistics Information:
· Muzzle Velocity: 771 fps
· Muzzle Energy: 66 ft. lbs.
Raw results(fps)
874.8; 771.8; 788.3; 913.1; 711.7; 725.1;778.3; 733.7;
742.3; 791.8; 706.4; 618.0; 691.1; 733.2; 745.7.
Max. = 913.1; Min. = 618.0; Average = 755.02, or ~755fps.
755/771 = 97.9% of stated Factory Performance (out of a 2” test Barrel) when fired from a Revolver with a 10-58” barrel. (-2.1%)
Hand Loads Tested:
#1. 50 grain FMJ-RN (Rem.), PPU Brass, WSP Primer, 2.7 grains of “Power Pistol” Propellant;
1118; 1220; 1170; 1278; 1190; 1273; 1130; 1189;
1201; 1302; 1244; 1195; 1136; 1213; 1188.
Max. = 1302; Min. = 1118; Average = 1203.1, or ~1203fps.
Calculated: 1302fps @ 17079psi and Actual 1203fps: -8.2%
#2. 63 grain Lead FN (Hunters supply), GFI Ni Brass, CCI SP Primer, Various Charges of “Bulleye” Propellant.
A. 1.36 +/-0.05 grains: 916.1; 876.8; 1042; error;955.5.
Max. = 1042; Min. = 876.8; Average = 947.6, or ~947fps.
Calculated: 937fps @ 14145psi and Actual 947fps; +1.1%
B. 1.39 +/-0.05 grains: 1162; 1075; 1060; 1150; 1104. (no Tape).
. : 1174 (case fail); 1056; 1030; 1129; 1288.
Max. = 1288; Min. = 1030; Average = 1122.8, or ~ 1123fps.
Calculated: 991fps @ 14808psi and Actual 1123fps: +13.3%
C. 1.43 +/-0.05 grains: error; 1164; 1179; 1149, FTF.
Max. =1179; Min. = 1149; Average =1164.0, or ~ 1164fps.
Calculated: 1009fps @ 15492psi and Actual 1164fps: +15.3%
NOTE: 1.46 grain data not taken/recorded.
D. 1.50 +/-0.05 grains: error; error; 1130; error; error.
Max. = 1130; Min. = 1130; Average = 1130, or ~ 1130fps.
Calculated: 1045fps @ 16925psi and Actual 1130fps: +8.1%
E. 1.53 +/-0.05 grains: 1062; 1070; 1028; 1066; 1043.
Max. = 1070; Min. = 1028; Average = 1953,8, or ~1054fps.
Calculated: 1063fps @ 17674psi and Actual 1054fps: -0.85%
F. 1.56 +/-0.05 grains: 1262; 1030; 1075; error; FTF.
Max. = 1262; Min. = 1030; Average = 1122.3, or ~ 1122fps.
Calculated: 1080fps @ 18445psi and Actual 1122fps: +3.9%
G. 1.60 +/-0.05 grains: error; FTF; 1354; 1138; 1210.
Max. = 1354; Min. = 1138; Average = 1234.0, or ~ 1234fps.
Calculated: 1097fps @ 19239psi and Actual 1234fps: +12.5%
H. 1.63 +/-0.05 grains: 1201; 1368; 1316; 1190; 1151.
Max. = 1368; Min. = 1151; Average = 1245.2, or ~ 1245fps.
Calculated: 1114fps @ 20058psi and Actual 1245fps: +11.8%
I. 1.67 +/-0.05 grains: 1239; 1182; 1231; 1096; 1278.
Max. = 1278; Min. = 1096; Average = 1205.2, or ~ 1205fps.
Calculated: 1131 fps @ 20696psi and Actual 1205fps: +6.5%
J. 1.70 +/-0.05 grains: 1297; 1375; 1243; 1238; 1329.
Max. = 1375; Min. = 1238; Average = 1296.4, or ~ 1296fps.
Calculated: 1147fps @ 21760psi and Actual 1296fps: +13%
K, 1.73 +/-0.05 grains: 1235; 1338: 1209; FTF; FTF.
Max. = 1338; Min. = 1209; Average = 1260.6, or ~ 1261fps.
Calculated: 1164fps @ 22849psi and Actual 1261fps: +8.3%
L. 1.77 +/-0.05 grains: 1229; 1257; 1232; 1289; 1276.
Max. = 1289; Min. = 1229; Average = 1256.6, or ~ 1257fps.
Calculated: 1180fps @ 23563psi and Actual 1257fps: +6.5%
M. 1.80+/-0.05 grains: 1266; 1268; 1214; 1241; 1242.
Max. = 1268; Min. = 1214; Average = 1246.2, or ~ 1246fps.
Calculated: 1196fps @ 24502psi and Actual 1244fps: +4.2%
NOTE: 1.84 grain Data not taken/recorded.
N. 1.87 +/-0.05 grains: 1311; 1275; 1175; 1214; Jam (not fired).
Max. = 1311; Min. = 1175; Average = 1243.7, or ~ 1244fps.
Calculated:1227 fps @ 26357psi and Actual 1244fps: +1.4%
3. 50 grain FMJ-RN (Rem.); GFI Ni Brass; CCI SP primer Propellant compare:
A. 1.50 +/-0.05 grains:”Bullseye”; 1188; FTF; error; 1179; 1278.
Max. = 1278; Min. = 1179; Average = 1215.0, or ~ 1215fps.
B. 1.50 +/-0.05 grains: “BE-86”: 1107; 1381; 996.2; 1147, error.
Max. = 1381; Min. =996.2; Average = 1157,8, or ~ 1158fps.
Conclusion: for the Same Charge Weight BE-86 Generates a lower Peak Pressure than Bullseye under the same conditions.
SUMMARY
Recorded data Results seems to vary from Calculated Values by Bilateral amounts. It is probable the sample size used is not adequate. It is also probable that the Charge Weights vary due to the Imprecise Scale used for the Charge Weight Resolution desired.
Due to the Low Value Charge Weights, in the range of 1.3 to 2.7 grains, and the marked Resolution of the Scale used, 0.1 grain, the interpolation of charges to 0.01 grain +/-0.05 grain is less than the observed variation in measured performance.
The instrument used has a measuring base of about 1 foot and four digit readout resolution but the full Accuracy and Resolution Specifications are not known at this time.
The factory Ammunition tested for comparison measured about 2.1% lower out of this 10-5/8” barrel compared to factory Test Barrel length of 2”. This is quite low compared to similar Barrel lengths tested By “Ballistics By The Inch” using a Single Shot Handgun with a Locked Breech and sealed length Barrel (no cylinder gap). They found a 10” barrel yielded Velocities about 28% increase in measured MV.
How much The Ambient temperature, and the temperature of the Instrument, which was in direct Sunlight, affected These Results is unknown at this time.
Overall, The confidence level in these results is low due to the reasons state in the summary but they ARE the Results obtained and recorded.
Best Regards,
Chev. William