havnt done much reloading but have 2 loads for .243 (70 balistic tip over 39gr h4895 and 100gr spbt over 33gr h4895) both accurate and brass comes out ok no pressure signs etc. been given some h4350 and loaded up some rounds of 100gr spbt used the same preping sizing trimming and seating as the other two rounds and loaded up from 38gr.
Velocities were as one would expect accuracy so so for 1st group 2nd and 3rd opened up alarmingly 4" at 150yds. The brass was sooty? no signs of excess pressure on primer. what the main cause of this? doesnt happen with other loads with identical brass, heads and prep?