Source:http://ritastatusreport.blogspot.nl/2015/03/autoloaded-is-3-short-history.html
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In mid-50’s, a part of the Soviet army was having a look at their heavy tanks, analyzing their issues and drawbacks. One of the major issues of the heavies was their low rate of fire. The two-piece shells were quite slow to load, resulting in average rates of fire somewhere between 2 and 3 rounds per minute (compared to 6 to 8 rounds per minute of the medium tanks). This was especially true for the 122mm shells of the D-25 gun and ways were sought to remedy the situation.
在50年代中期,苏联军方开始调查自己的重坦了,分析它们的问题和缺点。重坦其中一个主要的缺点是射速太低。分装弹药装填起来太慢,结果就是平均射速只有每分钟2~3发(和中坦的每分钟6~8发比起来还是低了)这个对于D-25炮和122mm弹药来说的确是个很大的问题,他们也就提出了很多用于解决这个问题的办法。