Second question, then...are you crimping your rounds? If so, how are you doing it?
Also--where exactly is the ammo hanging up and/or binding? Is it doing it as the ammunition barely enters the chamber? When the bolt is almost all the way closed?
Does the bolt close with force? When you extract the round, does the bullet show engraving from the lands?
I also load with the 175 grain MatchKing, seated to 2.820 COAL. I trim to 2.000 even, on top of 41.5 of RL15. I use Federal once fired cases, and I have some Remington and Lake City Match brass as well.
Hiding in plain sight...