The description for Hail says here:
Hail is an attempt to combine the penetration of titanium sabot with the versatility of a depleted uranium shell. It has tremendous damage potential, but should not be used at long ranges. Any pilot using this ammunition should be prepared to trade optimal range, falloff range, and tracking speed for a devastating amount of damage.
Hail is essentially supposed to represent an upgraded or higher tech version of the Depleted Uranium ammunition, considering that’s what you need to actually manufacture Hail, and I’ve also highlighted “versatility” here which Hail claims to have. While we can see higher kinetic damage, representing the greater penetration potential from the Titanium Sabot, yet the thermal damage from Depleted Uranium is missing entirely, which doesn’t seem to make much sense.
Shouldn’t some of the explosive damage be redistributed to become thermal damage? Even if it’s a small amount, say 2 to 4 base damage (using small sized example), it would be a lot more sensible IMO. Right now, Hail basically looks like another variant of Fusion which is already a shorter ranged, higher damage ammunition type with a focus on explosive damage.
Meanwhile, if you were to introduce thermal damage, both the DU and Hail charges would still have noticeable differences between them with distinctive strengths and weaknesses despite sharing the same damage types, along with having a more sensible “tech path” that Hail supposedly represents coming from DU.