Ok, I tested two distinct processes of brass prep. First batch was annealed and sized using forster bushing bump die+ carbide expander mandrel 21c. Second batch was not annealed, FL sized without a rod, then carbide expander mandrel 21c. Surprisingly, the second batch was giving me a really sticky bolt (what's wrong with FL sizing die???). Both batches trimmed to the length, chamf/deb, the same powder charge, the same seating depth, same bullet.
A little guessing game for you guys: first batch - 5 shots, second batch 10 shots. which column represents the first batch?