Anyone have information on the EXP 100gr 5.56 Black Hills

I’ve been researching this loading for a while just never got really serious about it until I found out about the terminal ballistics. I would love to find any data or information on the development of this cartridge.

Mike P

Besides this info.

It is my understanding that one 100gr experiment involved modifying a M856 Tracer projectile by replacing its tracer compound with lead.

This thread was recently revived over at A member just posted a picture of the Black Hills box.

I believe the ATK 100gr loading involved the modified M856 I mentioned above. Member “Sinister” was formerly the commander of the US Army Marksmanship Unit.