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I understand that the no.5 is graded up to 800 and the No.4 is graded up to 1300 but is the no.5 micrometer sight's 800 and below equal to the no.4's 800 and blow graduations? I am assuming they actually re-calibrated the no.5 sight to the ballistics of the no.5?
I am asking because i can get a no.5 micrometer locally cheap but its going on a no.4, will I have sight issues?
The correct 1300 yd No.4 rear sight you require is readily available from either SARCO or Springfield Sporters for quite nominal prices.
Yes, you will have sight issues if you fit an 800 yd sight to a No 4 rifle.
But, then again, you would have sight issues anyway even with a 1300yd sight unless the ammo you are using matches the ballistics of the original Mk 7 ball cartridge.
I quite like the 800yd sight because it has a finer adjustments per "click" than the 1300yd one does. It is really a matter of methodically spending range time with your chosen ammo and seeing where it shoots to the particular sight you have fitted to your rifle.
Suggested conversion table for 800yd sight fitted to No 4 rifle below.
I have worked this out by measuring that 1 click on a 1300yd sight moves the sight leaf .008", while an 800yd sight moves .00425" per click. Graduations are the same at 800yds
1300yd sight 800,.... 700,......... 600,..... 500,...... 400,....300,.... 200
..800yd sight 800, 700-1 click, 500 + 6, 400 + 4, 200 + 6, 200 -2, 200 -8
Put simply, in my limited experience of shooting and accuracy testing these rifles together, then using a No5 sight on a No4 and vice verca, you'll be miles out. And that is using the correct Mk7 ball ammo. I can't speak for what'll happen if you use commercial .303 ammo
my goodness, seems to be you spent some time on that but i bet is was funQuote:
Originally Posted by Maxwell Smart
---------- Post added at 11:05 PM ---------- Previous post was at 11:03 PM ----------
And here I though I was going to catch hell for asking. thanks gentlemen!
The good thing about this particular site is that you just have to ask, and you'll be told. You might not LIKE the answer or the way it's told but that's the nature of people. But you'll be told. Sometimes you'll get there by dint of the 'wisdom of the crowd' method - but we'll get there!
The main downside to this conversion is that most folk won't be able to zero at 800 yds. So now to do the matching zeros at 200 and up scale! (Not me, BTW, as I don't have this drama, but...) And---just out of curiosity, just how many clicks below 200 will the sight(s) go before bottoming out? If there was one at hand I'd try it myself, but they're 50-60km away right now. Not all that many clicks, is it?Quote:
Originally Posted by Maxwell Smart
10 clicks below 200.Quote:
Originally Posted by jmoore
The movement-per-click on a 800yd sight is only about half that of a 1300yd one.
Why do you need to zero at 800 yards?
Why not just zero at a shorter range using the No 5 sight, record the settings, then if you ever fit a No 4 sight you can dial it in pretty easily.
Surely, it'd be easier and simplere to just fit the correct sight for the rifle.......... yes? If you're short of a No4 Mk1 type backsight leaf, just tell me and I'll send you one. Or am I missing something?
I just grabbed a no.4 Mk2 for a nice price and it obviously has the 1300 milled micro. so problem solved. well, other than figuring out how to zero at 100 yards lol.
thank you for the offer, people like you keep the tiny bit of faith i have left in my heart lol
Generally the 100 yd zero is about 2-3 clicks below "2".Quote:
Originally Posted by PA_RIFLEMAN303
None of the sights I tried today would go more than 4 clicks below the "2" mark, neither No.4 nor No.5 types.Quote:
Originally Posted by Maxwell Smart
Because that's how your chart is laid out! The match is at "8". Therefore it follows that the baseline was set there. Otherwise, set the baseline at "2" for both sights.Quote:
Originally Posted by Maxwell Smart
JM, I still cannot see your point about the 800yd zero.
My conversion chart is simply intended to show the settings on the 800yd sight where the datum line matches the elevation marks on the 1300yd sight, taken from actual measurements of both types of sight. The DATUM LINES on the sights just happen to match at the 800yd mark.
Shooters will still need to shoot their own rifles at whatever range they choose, and make a note of their POA for given sight settings. This would always be the case for any modern ammunition which doesn't match Mk7 ballistics.
All of the dozen or so 800yd sights I have will go 10 clicks below 200.
1300yd sights 1 or 2 clicks below 200.