Need help adjusting front and rear sights for zero on No4 MK1/2

[Parashooter]

The entire point of my original question was this: If I establish my zero of 200yards at the 200 mark on the sight will I be able to use those remaining -3 clicks that I have available (bottoming out the sight) to put me right on at 100 yards?

Nobody can answer this for you because of the "it depends" factors -

• Is there significant backlash in your sight's elevation mechanism?
• Are you holding dead center or seeing it a little off?
• Is it sunny or cloudy? (This can make a big difference in perceived center.)

My No4's backsight gives 4.5 clicks below the 200 yard mark. If I need them, I'll use them - except that last half-click, which is really just backlash. If you want to use the 3 clicks below 200 that you report, go ahead. If some of them are actually backlash, you won't get the result you wanted. If you install the short front sight, what are you going to do on a day when you find your 100-yard group is a couple inches high with the rear bottomed-out? You'll be stuck holding low instead of just cranking down a couple clicks.

I have yet to meet a serious competitor using M1, M14, or M16 sights who relies on the graduations found on the elevation drum. (The 1/2-minute elevation drum on my AR-type doesn't even have graduations!) They count clicks from bottomed-out - quite a chore with half-minute clicks when shooting long-range, but worth the effort. You're complaining about counting just 15 very palpable one-minute clicks for a 200-yard zero on your Lee Enfield!? (If the clicks aren't strong, replace the detent spring - or the sight.)

If you really must look at the graduations, you should find those 15 clicks from the bottom place the marks aligned at 450 yards (unless you've got bad backlash). Is that so hard to remember?

Now you have some work to do (because you should learn this stuff for yourself) -

1. Measure the actual distance from the top of your front sight to the bore axis. (That's done by measuring from sight to barrel and adding half the barrel diameter.) It probably isn't the 0.8" I've used here.
2. Look up the ballistics of your ammo at Prvi Partizan Ammunition
3. Use those numbers to derive a ballistic coefficient at http://www.jbmballistics.com/ballist...culators.shtml
4. Plug the BC and sight height into JBM's trajectory calculator, along with Prvi's velocity and the atmospheric conditions of your choice.
5. Shoot some good groups at 100 yards to learn how much, or little, all this theory is worth.