Yes, when first heard about 300km like range from the AAv 2023 prob it was surprising given not primarily rocket motor based and we lacked in subsonic turbojet making.True that. Much longer range for MR though. Standard Harpoon Block II range is around 130km iirc.
Doubt the SLAM-ER version with 300km range would be available to us. But who needs it anyway.
can they use the short range versions IIR seeker on the mid range article like this ? if only terminal activation then prob can do with some minor enhanced thermal battery maybe.