During Viet Nam, a round was developed that was hollow and contained bunches of needles in the hollow casing, that when it fired, the needles would shred throughout the body, wreaking havoc. The Geneva Convention people outlawed it as too inhuman. It's purpose was not to kill as it was designed to injure the enemy so badly that the enemy was no longer a combatant. It takes 5 to 7 people to care for one wounded soldier. If it did kill, that was just a by-product, not the primary intent.
This round would be declared illegal if the Geneva people hear about it, however, it's just a normal Varmint Round. I used to shoot 22/250 rifles, and it was a standard round. The bullet disintegrates upon impact. Fairly safe to people/objects not hit by bullet, devastating to the target however.
BTW, these are for re-loaders only. I don't think you can buy ready-made ammunition with these bullets. They are only in .20 and .22 diameter rounds.