Brand new rifle so carbon/copper buildup will not be the issue. Not the ammo because the milder Fiocchi was giving the same pressure signs. Good point regarding the edges of the ejector holes but the tight bolt lift and the some shots going wide of the zero point leads me to think the most logical explanation has to be a wet chamber. I am going to give it another try tomorrow and will report back.
The comments about the Hornady superformance surprise me. I have put around 200 rounds of that through my Tikka 6.5 Creedmoor with very consistent performance and nor issues at all with pressure.
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