New vegas silent sniper7/14/2023 ![]() ![]() ![]() This averaged to 129.7 dB for a respectable reduction of 30.1 dB. Although this may not be lethal, it will cause serious injury to the wearer, in all probability breaking underlying bone. While the projectile did not totally penetrate the ceramic plate, it seriously deformed the far (inner) surface, producing a bulge of approximately 1 cm thickness and 5 cm diameter. We then fired one shot at a vest with Level 4 ceramic plates. Penetration testing was performed using the SP-6 armor piercing ammunition in the VSS suppressed rifle, and the projectile easily penetrated a standard Level 2 Kevlar vest. We did somewhat crude tests of penetration using items of interest to law enforcement and military personnel. Not having access to ballistic gelatin or ballistic clay, we could not observe wound characteristics of this weapon system. Velocity was 957.5 ft/second for the SP-5 SNIPER and 961.4 ft/second for the SP-6 armor piercing. The non-suppressed average was 159.8 dB with a zero standard deviation. For velocity and rate-of-fire measurements, we used a PACT chronograph/timer.įor our non-suppressed sound levels, we shot the SP-6 ammunition in the Vikhr. For sound measurements, we used the Larson-Davis 800B with the LD 2530 1/4 inch pressure microphone and a recently re-certified LD CA250 calibrator. We used the protocol in Mil-Std-1474D with the microphone 1 meter to the left of the muzzle 90 degrees to the bore axis and 1.6 meters above dirt (there was no grass in sight). The velocity of sound calculated to 1,143 ft/sec. The temperature was 83.5/29 (F/C), humidity was 37%, and the station pressure was 675 mmHg. We spent the better part of the only delightfully sunny day of our visit on the range performing function, velocity, sound, and crude penetration testing. There are no markings on the cartridge case examples we had – not even on the headstamp area normally used on the base. As observed below, all loadings appear to be corrosive. The ammunition SPAM cans we found that were marked SP-5 were actually labeled “SP-5 SNIPER” and were also black-tipped armor piercing like the SP-6 except loaded in brass (or brass plated) cases. The ball ammunition samples we had available were also in green steel cases and are assumed to be the SP-5 ammunition. Some were marked SP-6, and these did indeed hold armor piercing ammunition loaded in green steel cases. In the ammunition magazine that we searched, there were a number of wooden cases, each holding two sealed SPAM cans containing 400 rounds of 9x39mm ammunition each. We suspect the variable length is for different burn rates. We were not able to identify the powder used, but it is a variable length tubular powder. Powder weight was approximately 9.3 grains. With an overall loaded cartridge length of 55.3 mm, only about 12.6 mm of the projectile protrudes with over 2/3 of the projectile length inside the cartridge case. The example we disassembled (SP-6) has black paint on the tip indicating that it is armor piercing. The nominal 9mm spire-point boat-tail projectile is 40.1 mm long and 9.21 mm diameter. The case length is 38.7 mm long with a maximum diameter of 11.03mm. The 9x39mm cartridge case is based on the standard Soviet AK 7.62x39 case, except that the neck has been enlarged to accommodate a special 9mm projectile. We used a standard inertial bullet puller similar to the RCBS unit found on most handloaders’ workbenches. One of the first steps in evaluation was to disassemble a loaded cartridge to examine the components.
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