The following groups were from my Browning 270Win with a Boss set at 2.5. Scope is a Simons Aetec 2.8x10. They were all starting loads (55gr) of H4831SC with 130gr Accubonds. The only variable was the seating depth. They were -0.01, -0.05, -0.09 and -0.13 from the lands (shown in that order top to bottom). What length would you use to finish working up through different charge weights with? Honestly, I'm thinking of shooting the 0.05 and 0.09 again with a 0.07 thrown in for good measure. Opinions? BTW, this was the first time I've EVER handloaded. Also my 1st time behind the trigger this year. Not great by most standards, but not bad for a 1st time I hope. Oh, the 0.9group had me excited. First 3 rounds were the ones that are touching.