Try West Coast Bullets (Carson City, NV) or Sinterfire.
Either of these outfits will accommodate you.
Be careful after seating frangible rounds - none or next to no crimp. Too much & the projectile will break around the mouth of the case.
Frangible bullets are made of a lighter (less dense) material than a traditional all lead or jacketed ones. The material is actually compressed metal powder (zinc, copper etc).
Adjust your charge weight accordingly if you adhere to IDPA or IPSC power factors.
For ex. a 9mm bullet of similar size to a 124 gr. FMJ will weigh in at around 100 gr. (West Coast Bullets) These work great for Steel Challenge!!!!!!!
Happy shooting.......
Regards
LFOD - IRAQ
Thank you for the tip, and thank you for your service to our nation. Salute!