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• Ballistic Missile usually don't have a fixed warhead, rather a curve of warhead Vs range. For Iskander it's 700kg at 500km to 500kg to 400km.It seems now the Iskander and Oniks have similar weights of around 3.5 ish tons and 600 km range.
• For BrahMos it's a fixed 300kg at 850km.
• Iskander not only let's you play in the warhead weight but also supports multiple different warhead types compared to just SAPHE on BrahMos.
• The biggest reason for using Oniks is it's cost. Oniks/BrahMos is an insanely expensive weapon because of things like active radar seeker and ramjet engine. I don't have any hard data but my estimation is it's $5 mil a pop for BrahMos; should be slightly less for Oniks.Russia or any other force standardize around Oniks considering that both costs nearly same?
• Iskander is an extremely simple missile compared to BrahMos. Just a big solid booster, warhead, a CAS and a rudimentary INS + GNSS in majority of the variants. We again don't have any hard data but a similar ATACMS cost $1.5m per shot.
• This is where simple ballistic missiles shine; you can do a barrage attack with them because you can fire 3x. If BrahMos would haven't been so expensive then we'd have seen more of them on our warships instead of just 16.
• Every single weapon is for one specific target, we can definitely use it for others but the efficiency would decrease. A full power rifle can go through most of the body armours but this doesn't mean we can replace pistol, SMGs and shotguns with those.What's the special necessity of less survivable quasi-ballistic missile when it goes only to low supersonic at terminal phase bleeding energy
• There are numerous targets like forward staging areas that need multiple missile like and don't have adequate ADS to counter a quasi-ballistic missiles; you can't waste $15 mil for this.
This same applies to Iskander too. If economies of scale is utilised to its fullest then a solid rocket motor would be cheaper than ramjet because before Iskander way more solid rocket motors have been made compared to numbers of liquid ramjet before Oniks.I don't believe on Ramjets being expensive to manufacture. It's just economies of scale problem.
Again, my whole argument is based on the current scenario. If someone comes up tomorrow with a $2 mil supersonic cruise missile then there's absolutely no need for these short range ballistic missiles, throw them away. But till then this is the most efficient way