[FONT=&]The 130 mm AK-130 (A-218), A-217 (single barrel precursor to the twin-barrel AK-130), A-192, and A-219M Naval gun systems, along with the A-222 "Bereg" coastal gun system all use the same 130 mm ammunition and have common 54-calibre (6,990 mm) length barrels. I take it this is the barrel length minus the breech and muzzle brake, but its not clear. The fixed rounds contain ≈10.5 kg of propellent behind a common 33.4 kg weight projectile. This generates a muzzle velocity (MV) of ≈850 m/s and muzzle energy (ME) of ≈12.1 MJ.
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[FONT=&]The M-46, its barrel length ≈58.5-calibres (7,600 mm) with the breech included, or ≈52.7-calibres (6,850 mm) for the barrel alone; the bore is [/FONT][FONT=&][FONT=&]≈[/FONT]45.1-calibres (5,860 mm). Again, it uses the common weight 33.4 kg projectiles. Its max charge containing ≈13.0 kg of propellant, which gives it an MV or ≈930 m/s and an ME of ≈14.4 MJ.
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[FONT=&]The KS-30, its barrel length ≈63.6-calibres (8,266 mm) with the breech included, or 60.3-calibres (7,837 mm) for the barrel alone[/FONT][FONT=&][FONT=&]; the bore is [/FONT][FONT=&][FONT=&]≈[/FONT]51.6-calibres ([/FONT]6,714 mm). Again, it uses the common weight 33.4 kg projectiles. Its max charge containing ≈14.3 kg of propellant, which gives it an MV or ≈970 m/s and an ME of ≈15.7 MJ.
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[FONT=&]So, to answer your question, AK-130 is powerful, as it has a rapid rate of fire (43-46 rounds a minute), but it doesn’t produce as high a muzzle energy as the other 130 mm guns. Saying that, some sources say its initial MV is ≈956 m/s, which ups its ME to ≈15.3 MJ, but I can't conform this fact.[/FONT]