I am not an expert loader by any means. Self taught. I talked to several guys who belong to a local club about this barrel. One asked about annealing. I have not annealed the cases. But with only about 4 rounds thru each case two of the guys agreed I should not have to do that yet. I put this barrel on myself and checked headspace with a go, no go, and a field gauge by foster. I am FL sizing and the die is set correct. I am not new to reloading, been doing it for 30 years, but still have lots to learn and want to know. If there is a carbon ring can you feel it when you run a patch thru?? Temps when I first shot were in the 60's-70. Now in the 30's. I did shoot today and may have found another load. Very frustrating. I shoot 4064 in 5 other rifles and never a issue until this year. Now my 338 win mag won't shoot it. Switched that over to H4350.