How about an overview of the method depicted in the Alex Wheeler video for us poor unfortunate souls living so deep in the bush that we’re still stuck with an incapable, fatally obsolete, and stooopid slow dial-up infernal.net connection?
1) Pull the firing pin assembly out of your bolt.
2) Pull the ejector spring out of your bolt
The bolt will now open/close freely with zero resistance. The handle will fall if you lift it up.
3) Size a piece of brass, so that it freely chambers with zero resistance. You want the action to feel just the same as when there's no brass. Don't size too much, just to the point where it's free in the chamber.
Note that clipping the case under the extractor claw then feeding the bolt/case together into the action is helpful. This way you don't feel the case being forced/clipped under the extractor when you chamber it.
4) Seat your bullet, slightly long. Attempt to chamber it without forcing. If it won't chamber, then you're still jamming the bullet into the lands.
5) Keep seating the bullet in further in small increments, attempting to chamber each time.
There will finally come a point where just the weight of the bolt handle alone will chamber the round, ie if you let go of the bolt it will fall closed. Now you're almost there....
On bolt lift at the top of the bolt handle travel, you reach primary extraction where the bolt is mechanically pulled back by the little ramp on the back of the action up against the bolt handle. This pulls the bullet/case back out of the chamber. If the bullet is still in the lands... even if it was just pushed in there by the weight of the bolt handle falling, you will feel a little "click" at the top of the bolt lift stroke. This is the bullet being pulled out of the lands.
6) Keep seating the bullet in further, .001 at a time, until the faint bolt "click" at the top disappears. The last measurement where there was any sort of "click" or resistance when reaching the top of the bolt lift is your touch point for the lands. Measure with comparator and you're done.
Note that during the last step, it's necessary to clip the cartridge under the extractor before chambering. It's also important to avoid pushing the bolt forward so that you don't use any "play" in the action to create a false reading by shoving the bullet into the lands by hand.
Hope this helps!
