I couldn't find much on it. Seems like it might be a proprietary bullet for HSM? Might get some better info reaching out to them.
The bullet used in the HSM Low Recoil 85-grain ammunition (specifically chambered for .243 Winchester) is a proprietary Sierra 85-grain Tipped Spitzer Boat Tail (SBT) bullet.
Here are the specific details of the bullet:
- Manufacturer: Sierra Bullets, designed in a special partnership with Hunting Shack Munitions (HSM).
- Design: It features a distinct orange polymer tip (often referred to as an OPT or Ballistic Tip).