The bolt on my .338 Win Mag stainless is difficult to open. It is the same after firing factory or reloads. It is also the same after a dry fire. The bolt will not open under the weight of the rifle by it self, I have to really hang on and force it open. I have pulled the bolt apart, cleaned and re greased all the areas that were greased from the factory. Is a grease the best thing to use in between the bolt body and the outer sleeve as well as on the threads? Also, should I be greasing/ lubing the firing pin spring? Should I pull the sleeve off and Flitz the inner bolt? Should I lap the lugs? I use Sinclair bolt grease.