As Mk VII stated, it's normal for the bolt to feel very hard to close. If it feels very very very hard it's possible that the striker may be binding a bit within the bolt. Cleaning and lubrication wouldn't hurt in any case. I'll bet quite a few moose have been taken with a .303, eh?
Nomenclature; the cocking piece at the rear of the bolt is engaged by the upper arm of the sear.