338/ 300 Ultra + 101 grains US869 + Federal 215 + 300 smk (3.830 OAL)= extractor mark. 338/ 300 Ultra + 102 grains US869 + Federal 215 + 300 smk (3.930 OAL)= no pressure signs. It appears that seating a little deeper makes a lot of pressure difference. Is this consistent with anyone else's experiences? Is there another variable I may be overlooking? These were both 3 shot groups with Remington brass. One round was fired with 102 grains in the first series and it left a shiny, but not raised extractor mark.