http://armor.kiev.ua/army/hist/ptr-1.shtml
Designers of gun - polish officer Felstin and the graduate of Warsaw polytechnic university engineer the Eji Maroschuk.
So that the mass of gun would not exceed 10 kg, they selected rifle calibr. with the caliber of cartridge 7,92 mm the length of brass bottle flangeless case it became considerably more, than in usual cartridge was 107,3 mm. its pointed, with the cylindrical ground part, bullet DS with a mass of 12,7, it developed in the stem with a length of 1290 mm speed to 1500 m/s, breaking through on the distance of 300 m the steel plate with a thickness of 15 mm at angle of 60°. It was possible to attain this because of the large length of stem in combination with the powerful powder charge of armor-piercing cartridge. Bullet had iron, plated by German silver shell and lead core (some sources they indicate that core it could be manufactured from carbide of tungsten).
The carried out tests attested to the fact that the gun can effectively be used against 70 % armaments of Wehrmacht. For increasing the rate of fire they equipped gun with 3- charge store. In connection with the high loads the period of the service of stem composed 500 shots (on other information only 200).
During October 1938 Polish army obtained the first 2000 guns. During August of their 1939 there was already by 3500, which composed approximately 45% of the planned 7610 pieces.
The superfluous measures of secrecy led to the fact that this powerful anti-tank weapon remained unmastered and not it was used properly during September 1939.
To Wehrmacht as the trophies were reached 886 guns. The guns received index PzB was in service into Vaffen SS and it was by them used in the war against THE USSR. Part PTR PzB transmitted to Italian and Hungarian armies...
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