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Zeroing my Ishapore 2A

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Zaravia View Drop Down
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    Posted: February 03 2015 at 7:56pm
After some minor home gunsmithing, I was able to reindex the front sight base on my Ishapore. When I took it to the range again, it was shooting perfectly for windage. However, I am still unsure as to how I should zero this gun for elevation. Do I set the rear site elevation at 200 yards, then zero at 25 yards? That is what I do with my FAL, and it seems to work with the .308 round. I am just not sure. Hope this hasn't been asked before; I searched but I couldn't find anything.

Thanks!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: February 03 2015 at 9:52pm
i dont think the rear sight on the 2A was regulated specifically to the 762x51 , i think they were carry over sights - close but not as good as the improved 2A1 , that said you should be able to get it to work with minor allowances 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zaravia Quote  Post ReplyReply Direct Link To This Post Posted: February 03 2015 at 10:43pm
Yes, I was given to understand the 2A sights, regulated for .303 in yards, more or less worked for 7.62x51 in meters.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DairyFarmer Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2015 at 4:06am
Originally posted by Zaravia Zaravia wrote:

Do I set the rear site elevation at 200 yards, then zero at 25 yards?
.303
Sierra 174gr HPBT (.499BC)
Sight height 0mm
Velocity 2400fps
 
1.5" high at 25m
2.5" high at 50m
3.5" high at 100m
2.5" high at 150m
0 at 200m
4.5" low at 250m
11.25" low at 300m
63" low at 500m
 
Please anyone correct me. I'm working on pure theoretical figures.
 
You need 4 things to calculate the "near" and "far" point blank ranges:
1 - Bullet weight
2 - Ballistic Coefficient
3 - Velocity
4 - Sight height
 
Download the free program called PointBlank. Enter the details and it will give you the bullet trajectory.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zaravia Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2015 at 10:11am
Cool, thanks for the tip. I will take a look at it. Does anyone know what the British or Indian Army process for zeroing the rifle was? Or did they not trust the average soldier to do that kind of thing?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2015 at 5:02pm
that data is out there , i think someone here - or who used to visit here has posted it before [maybe i remember it from another site ] but someone here should have it and will probably drop by , if i happen upon it in my evenings travel ill try to link it , 


not sure this works -

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Canuck Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2015 at 5:47pm
That link would make a good 'sticky' to have here.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DairyFarmer Quote  Post ReplyReply Direct Link To This Post Posted: February 04 2015 at 7:35pm
I crunched some more figures. If you raise the sights to 2" the near = 25m and the far = 200m.
 
For all my reloading I start testing at 20m. I shoot 5 shot groups. This gives me grouping and velocity. I'm not concerned with the windage or elevation at this stage. I just need to know the ammo is grouping and what speed its traveling. After that, without adjusting the sights I do a 3 shot group at 100m.
 
Next I put it all into PointBlank. I can now see if my 100m elevation is what the theoretical is. It is normally close as damnit. I can now go set the sights using the near point blank range. Once the sights are set I check against the zero distance I require.
 
You just have to remember that at 20m all corrections are 5x what they are at 100m.
 
Oh, and don't forget your fouler rounds. I usually have a bunch or rounds that were either unsatisfactory reloads, or new brass I'm form firing. Never try zeroing with a clean rifle. Dry the barrel and action of any oil. Then shoot a few foulers just to get the barrel warmed up and the oil burned off.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: February 05 2015 at 5:02am
Yes the link works.

If you can repost it to a new thread, somewhere in the "info for new owners" maybe? I'll sticky it.
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