Can't ID No4MK1 rifle ...

[Mk VII]

All Lee turnbolt actions require the spring compressing during the closing stroke of the bolt, so that is why the final inch is hard to push.
'Headspace' on Lee-Enfields, can be considered as distance between bolthead face and the recess on the rear of the barrel on which the cartridge rim sits. It is measured with proper Go/NoGo gauges, not gaffer tape, beer can shims, strips of cardboard or other expedients. Americans seem obsessed with this, perhaps because they get sold all the junk guns that are unsellable to other gun-owning countries, or maybe because it's easy to change by parts substitution (although this opens up other problems). Many of the L-Es sold in America seem to have been separated from their correct bolt over the years and this increases the likelihood of a problem.
British commercial proof marks are visible, a form of testing required by law in most nations with any sort of a gun industry, with the glaring exception of the United States.

Information

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[Steve H. in N.Y.]

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.

[Wendigo]

Thanks for the Info guys, much appreciated. I'll post some pics and a note after I get it cleaned up and test fired.

Cheers !

[Rule .303]

Be sure to clean out all of the old grease from the inside of the bolt.
Mine (circa 1942) was gooey and petrified. This will slow down the lock time (trigger release to firing, simply). Re-lube lightly with gun grease.

If your goal is Moose, use HEAVY bullets! 180 gr. soft points or better.