Many of the overhyped American defense innovations have failed in actual use scenario. One perfect example is that of the Lockheed Martin F-35 Lightning II fighter jet. The Americans spent around $1.7 trillion on the development of this jet, and in the end they got a product that is much inferior to the Russian Sukhoi Su-57 (which was developed at a cost of around $60 billion). And the most comic part is that a part of the cost was borne by the European allies such as France and Germany. The unit cost is also much lower. Su-57 costs $35 per piece, while F-35 costs $110 million.
I am not supporting government corruption but no country is devoid of corrupt politicians and stealing from military budget, is the easiest. Government try to hide investments in military equipment to prevent probation of the high amount. All countries brag about their product and find ways to spy into other countries inventions, which could be reason for the disappointmect in the stronger ammunition discovery of Russia.