Mike
What is the designed operational velocity for these projectiles? On the far end of a long range shot the velocity may be quite low, 1300 to 1700 fps.
It sounds like they're more on the near end of the hunting range than the far end. Generally you'll find that long range shooters prefer a high B.C. bullet, which often equates to a heavier projectile of the particular class being discussed.
As to killing potential on a long range shot when the remaining velocity and energy is low, it's due to penetration and not Kinetic Energy if I understand it correctly.
I can understand the desire to have a frangible .50 cal projectile. I personally don't have a .50 caliber rifle because of the concern over a projectile that's reluctant to stop for animals and small to medium sized trees. As to a .30 caliber frangible round, I believe I may be interested in them for short range varminting and testing on larger game and then based on that perhaps a long range test.
What's the offering in .30 caliber?
What's the BC of the various projectiles?
How are they effected by engraving forces (I shoot polygonal rifled barrels that are a little bore tight).
What material is used in these bullets, I may end up eating a little of it.
What's the cost and box quantity?