Using Nikon P-300 scope with .223 ammo

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beardking

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I have kind of an odd question. I built a .300 BO AR and put a Nikon P-300 scope on it and it works great using .300 BO ammo. However, I don't shoot .300 BO very often, so I've been thinking about converting it over to .223/5.56 for casual range use. BUT, I don't want to go out and buy another scope right now (well, I do, but my checking account doesn't want me to).

So, the question is, does anyone know how I would need to adjust when shooting .223/5.56 ammo out of the rifle while using this scope? Anyone have any experience doing this?
 

swampratt

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All guns will have a tad different velocity for a load and the best thing to do with any of them is to set up a target at 100 yards and get the scope hitting it on the nose.

If you plan on shooting farther then get a large cardboard box like on a refrigerator came in.
Set it at your max distance say it is 500 yards.
You know at 100 you will hit the dead center of the X.

Now move to 200 yards and aim at the X and shoot 3 shots.
Hold the rifle and scope steady and place the crosshair center at the X and notice where the 3 bullets landed on the reticle.
You can turn the power ring up or down to get it right on a hash mark.

Try to follow me here.
If it is 2 hash marks down at 7 power then you could hold 2 hash marks above the X and should hit it if you were 200 yards out.
I do that for all my rifles and write down the distances and power settings on paper and tape it to the rifle stock.

After you do that with the load you found most accurate you have no excuses for missing the shot.
You need to cover it with clear tape so it does not wear out.


Little worn out like this on my .308. I got another scope so I need to do it all over again anyway.
003.JPG
 

Mad Professor

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I have kind of an odd question. I built a .300 BO AR and put a Nikon P-300 scope on it and it works great using .300 BO ammo. However, I don't shoot .300 BO very often, so I've been thinking about converting it over to .223/5.56 for casual range use. BUT, I don't want to go out and buy another scope right now (well, I do, but my checking account doesn't want me to).

So, the question is, does anyone know how I would need to adjust when shooting .223/5.56 ammo out of the rifle while using this scope? Anyone have any experience doing this?

If you have an iPhone or IPad, you can use StrelokPro to make all the calculations for almost any rifle and scope combinations. The P-300 super sub reticle is covered.

I highly recommend the app.
I quickly tossed the reticle at one of my .233 rifle to get this.


b120d7a7896952b77ecd7a88a30e8948.jpg
 

undeg01

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Nikon Spot-On is their ap. It works pretty good.

I ran the following as an example of how it would work, selecting the P-300 scope and 223 round.

3CE6FD93-F0CA-49AE-9D40-3E1E3030C0FD.png


1B35B863-FB3B-47A6-A67F-9646792168A1.png
 

beardking

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Thank you all for the information. I was pretty sure Nikon had an app, but didn't think about using it to work with the "wrong" ammo. :-)
 

dennishoddy

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If you don't shoot a lot of calibers, you could just set up and use Kentucky windage using a notebook to write down the difference, but that's old school.......
 

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