Brady the Cast Performance bullets are heat treated as well with a final BHN of around 18 to 20+ Matt's Bullets are also although he doesn't specify the final BHN I'm it's pretty close to the same as the CP bullets. I heat treat my bullets as well for some applications depending on the velocity / pressure of the load I'm going to be shooting them at. With a plain base bullet of the right hardness and a god lube that fits the bore properly usually around 1600 fps. is about Max maybe a bit slower otherwise I would go with a checked bullet.

Check out Full.Lead.Taco on YouTube, he cast, loads and shoots a lot of big calibers in handguns an rifles.