Jimboslice

Hello I need help.... I have A DPMS 308 20" barrel , 7.25" buffer to and a 34 coil Spring my question is what weight should I be running on the buffer weight. Currently have a 3.33 Ounce Add of the weight itself is 2.5" long ... My problem is when Shooting the BCG is slamming into the round as it's attempting to chamber After firing previous round it is Ejecting the Spent brass at about the 3 o'clock position... With no stove pipes or double feed issues.... Any help would be greatly appreciated