Shooting 22-250AI 8" twist 26" BBL 43grs of H4831SC produced 3,340 MV 80gr Berger VLDs with some cases showing shinny ejector marks. IMR 4007 39grs same bullet produced 3,365 AVG MV and no pressure signs. Both loads producing 1/2 MOA with low ES. What is happening inside my chamber? Why the difference? Thought were suppose to burn the slow burners with Heavy bullets?