Chris, Years ago I started asking pertinate questions of those doing CCH for my clients. They in general all said they kept their furnaces at 1300 to 1250 degrees. My source of CCH uses 1300 degrees for his color hardening. I send approx. 50-60 guns a year to him for this service , being doing so for the past 8 years --- no problems with metal moving, cracked frames or any unhappy clients. That's lots of guns with no problems. FWIW


Ken Hurst
910-221-5288