Damian90 Posted December 5, 2022 Share Posted December 5, 2022 @Ssnake I found interesting patent document. https://www.fips.ru/ofpstorage/Doc/IZPM/RUNWC1/000/000/002/781/472/ИЗ-02781472-00001/document.pdf It says that 30mm 2A42 autocannon have problems firing 3UBR8 APDS (and presumably also newer 3UBR11 APFSDS?), it is caused by interference of muzzle break with round (sabot issue?), causing drastic increase in projectiles spread, that is around 1m or more at 100m. Solution found was to bore out muzzle break by 1-2mm, then projectiles spread increases to acceptable levels. However it is not known if this modification is widespread. In Ukraine it seems that BMP-2's and BMD-2's use mostly 3UBR6 APBC. These problems are not present with 2A72 30mm autocannon because it lacks muzzle break. 0 Quote Link to comment Share on other sites More sharing options...
Members Ssnake Posted December 6, 2022 Members Share Posted December 6, 2022 Muzzle brakes and discarding sabots didn't mix well even in M47 days, some 60 to 70 years ago. 0 Quote Link to comment Share on other sites More sharing options...
Jartsev Posted December 6, 2022 Share Posted December 6, 2022 well, there are bit more problems with 3UBR8 itself(and those issues are way more interesting, because they impact ammo feeding systems of some vehicles). But speaking of 2A42 it is worth to keep in mind, that particular gun can work fine with muzzle brake removed. 0 Quote Link to comment Share on other sites More sharing options...
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