I am reloading for a rem 700 in 7mm rem mag. I am having problem with extraction with my reloads. Factory cycles fires fine. Mine load smooth. Only after firing I am getting stiff bolt lift. Loads with 100 grain sierra and 140 bergers. Sent 5 fired cases to redding. I am using type s full length sizing bushing dies. These are once fired reloads. Checked my distance from lands and it's all good. Redding sent 3 back and they fed ok. My problem is bolt lift and extraction. No flattened primers. Chrony numbers are good. The 140 load with n560 is on the low side from berger info. The sierra is close to max, but it is accurate as heck. I measured above the belt and it looks ok. What could I be missing? Thxs hide!