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Thread: No4 Mk1 front sight blade size question

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    Member elvis3006's Avatar
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    No4 Mk1 front sight blade size question

    What size front blade sight do I need to bring my POI to the center of black square ? I am shooting Sellier and Bellot 303 Britishicon 180 gr FMJ bullets. The picture is of a zeroing target 3 round group at 25 yards at a 1.5 inch by 1 inch black square the current front sight blade size on the rifle is .030 Can anyone tell me what size front blade sight I need please. Thank you

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    Member Otbed's Avatar
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    I think a .060 or .075, probably a .075. At 25 yards the increment should be .475" per blade change. See here:
    http://www.milsurps.com/content.php?...No.5-Rifles%29

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    Member elvis3006's Avatar
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    Quote Originally Posted by Otbed View Post
    I think a .060 or .075, probably a .075. At 25 yards the increment should be .475" per blade change. See here:
    http://www.milsurps.com/content.php?...No.5-Rifles%29
    Thank you, I will get a .060 blade I have a .075 blade and tried that and that brought my POI too low. Would a .045 blade still be too high ?

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    Really Senior Member nijalninja's Avatar
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    This is kind of not really helpful but considering the difference in factory ammo today and military ammo of last century it'll be a bit of a muck since the existing rules the brits came up with to align and choose sights were really only for the military ammo. That being said, I hope you get a good sight and everything works out well.

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    Member elvis3006's Avatar
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    Quote Originally Posted by nijalninja View Post
    This is kind of not really helpful but considering the difference in factory ammo today and military ammo of last century it'll be a bit of a muck since the existing rules the brits came up with to align and choose sights were really only for the military ammo. That being said, I hope you get a good sight and everything works out well.
    True about the ammo but thank you anyway.

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    Really Senior Member Sunray's Avatar
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    You need to move the front sight to the right using a sight pusher. Sighting in at 25 is really too close though. Sighting in dead on at 25 will put you 3 to 6 inches high at 100 depending on which rear sight you have.
    Wouldn't even think about changing ammo though. The group will be bigger at 100, but not by much.
    Spelling and Grammar count!

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    Advisory Panel browningautorifle's Avatar
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    You aren't going to spend your time grouping at 25 yds are you? Better try out at 100 and see before changing anything except the vertical line.
    Regards, Jim

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    Member elvis3006's Avatar
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    Quote Originally Posted by Sunray View Post
    You need to move the front sight to the right using a sight pusher. Sighting in at 25 is really too close though. Sighting in dead on at 25 will put you 3 to 6 inches high at 100 depending on which rear sight you have.
    Wouldn't even think about changing ammo though. The group will be bigger at 100, but not by much.
    Yes I am aware of moving my front sight thank you.

    ---------- Post added at 06:13 PM ---------- Previous post was at 06:09 PM ----------

    Quote Originally Posted by browningautorifleicon View Post
    You aren't going to spend your time grouping at 25 yds are you? Better try out at 100 and see before changing anything except the vertical line.
    Of course I am not staying at 25, went out to 100 and still would like to bring my POI down. Thank you for the help everyone I am just going to buy several sized front sights and try that way. Just thought someone with experience could look at the picture and say try a 045 or 060. Mods delete post. Thank you.

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    Contributing Member CINDERS's Avatar
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    The best way is to shoot all the ranges your going to and DOPE it all of us here have the charts on our rifles its just to difficult with modern projies to get it all to marry up in fact if you check the B.C for the Sierra the things BC changes as velocity drops off.
    Peter L told me get on the range do the shooting & note what it is so at 400yds you may have 500 + 2 clicks on the back sight or 450 + 1 click who knows they are all different animals, if you change the load even a simple thing like a primer it may alter the POI then your back to square 1.
    All my shooters that's 5 of them all shoot the same load with 2 different projectiles all the sight settings for those 2 projectiles are committed to the book everything else Primer, Case & Powder charge and COAL are kept the same, it does pay to also have the data on a spread sheet as well as the little book in the gun case. Its that simple..........

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    Contributing Member 30Three's Avatar
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    I bet that's not far off at 200 yards. I would adjust for the lateral error and test it at 200 if you have the possibility before changing the blade.


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