This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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That's interesting. The PLAN 37 x 240 is credited with firing a 725 g pro at 1,010 m/s, which is VERY close to the Yenisey.
NORINCO has offered a couple of mountings - the original H/PJ76F naval twin mount in 37 x 240 (RoF 360 rpm per barrel, apparently based on the OTOBreda Fast Forty / Bofors) and the much simpler "semi-automatic" AN3, available in 37 x 240 or 35 x 228 Oerlikon. This gun is based on the Oerlikon KDF and fires at 550 rpm.
The pic shows a 35 x 228 round above a replica of the 37 x 240. The main difference in effect is that the 37 mm fires a heavier projectile at a lower velocity.