Re: 6.5-284 coal question
3.10 sounds like the bullet might be entering the lands and is being pushed back into the case. Based on these numbers the bullet is entering the lands .07 before the case is fulling inserted and bolt locked. I can not imagine any other reason for this occurance. My guess, let me know, is that after you chamber and cycle the bolt, the second cycle of the bolt you don't experience this bolt resistance.
I don't know what book you used to develop the load but I would double check the numbers. Bullet types, weights, etc have to all be measured properly to ensure the correct seating depth is acheived. Two bad things that happen is high chamber pressure and the possibilty the bullet gets stuck in the lands when you try to remove the unfired cartridge. Now you have stuck bullet and powder all over inside your action.