on his blog, Yuri Pasholok posted answers to two questions, that seem to appear on RU forums.
Q: Why does the Sturer Emil carry only 15 rounds of ammunition? Wiki and other sites state 18!
Answer lies in this picture (Sturer Emil’s combat compartment with ammo slots designated in numbers – it’s really 15)
Q: Why does the S-51 not have its historical 40 degrees gun traverse?
Apparently, the number “40″ (often cited on Russian sites) was a typo. Here is the original report, that clearly shows 4 degrees.