Hello. I’m having an issue with my new Tikka Roughtech in 6.5 PRC. I’m in the process of load development and just started to notice an occasional sticky bolt during extraction of fired cases. There’s been no signs of pressure. Today I was testing seating depths, so every round had the same charge weight. I would say roughly 1/4 lbs f the spent cases were hard to extract. I did notice that the cases that were hard to extract has a dull finish to them whereas those that ejected smooth had the traditional glossy look to them. I chronoed everything and the was no excessive velocity to those problematic cases. These are new Lapua cases with 156gr Bergers and 56.1 grn H1000. I shot 3 shot groups resting one minute between each shot and five minutes between groups. All new cases were full length sized and trimmed prior to loading. Any ideas would be greatly appreciated.