Nikon P-308 Instruction Manual
Manufacturer:
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Fr
4-12×40
Instruction manual/Mode d'emploi
Printed in the Philippines (815C)1E/1410
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Congratulations on your choice of a Nikon P-308 Riescope. Your new scope is the nest example of Nikon’s rugged and durable construction and precision bright optics; important qualities for a serious shooter’s riescope.
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Whether you use your scope for hunting or for target shooting, the procedure for mounting is identical. A set of high-quality steel mounting rings which have a standard diameter of 1 in (25.4 mm) are required to mount
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the scope. Follow the ring manufacturer’s instructions for mounting procedures. After mounting the scope on your rie, follow the procedures for reticle alignment.
IMPORTANT INFORMATION
IT IS IMPORTANT THAT YOUR NIKON RIFLESCOPE IS MOUNTED PROPERLY AND THAT CAREFUL CONSIDERATION BE GIVEN WHEN MOUNTING YOUR NIKON RIFLESCOPE ON A FIREARM.
WE HIGHLY RECOMMEND THAT YOUR NIKON RIFLESCOPE BE MOUNTED ON YOUR FIREARM BY AN EXPERIENCED, REPUTABLE GUNSMITH.
THE USER ASSUMES ALL RESPONSIBILITY AND LIABILITY FOR HAVING THE NIKON RIFLESCOPE PROPERLY MOUNTED TO A FIREARM AND USING THE NIKON RIFLESCOPE PROPERLY.
ALWAYS CHECK THE CONDITION OF YOUR MOUNTING SYSTEM PRIOR TO USING YOUR FIREARM.
SUPPLIED ITEM(S)
Body ·························································1 piece
Eyepiece cap ············
Objective cap···········
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································1 pair
Caution
(1) Do NOT look at the sun through the riescope. It will permanently damage your eye. This precaution applies to all optical devices, such as cameras and binoculars.
(2) The riescope is eectively sealed against moisture and dust. You may use your scope safely either in the rain or in dusty climates. To preserve the appearance of the scope, we recommend that it be dried and
cleaned prior to storage. Use a soft cloth for cleaning metal surfaces and use photographic lens tissue to clean the scope’s lenses.
When setting the reticle for hunting, you should determine your standard range and then adjust the reticle based upon that target distance. For targets which vary from that standard distance, according to personal
preference, you may simply adjust the position of the reticle in relation to your target, or you may wish to use the procedure for trajectory compensation.
We hope that you will enjoy your new Nikon Riescope for many years to come. Enjoy using it, and above all, always follow safe shooting procedures.
N.B. Export of the products* in this manual may be controlled under the laws and relatives of the exporting country. Appropriate export procedure, such as obtaining of export license, shall be required in case of export.
*Products: Hardware and its technical information (including software)
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1. Nomenclature
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4-12×40
1 Objective lens
2 Eyepiece lens
3 Elevation adjustment turret
4 Windage adjustment turret
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5 Eyepiece adjustment
6 Power index dot
7 Power scale
8 Power selector ring
9 Diopter index dot
Fig. 1
2. Specications
Actual Magnication (×) 4-12×
Objective Diameter (mm) 40
Exit Pupil (mm) 3.3 (at 12×)
Eye Relief ** (mm)
(in)
Tube Diameter (mm)
(in)
Objective Tube Diameter (mm)
(in)
Outside Diameter of Eyepiece (mm)
(in)
Adjustment Graduation 1click: 7 mm @ 100 m
Max Internal Adjustment (Elevation & Windage) *(MOA) 60
Parallax Setting (m)
(yd)
Field of View at 100 yd/m ** (m)
(ft)
Length (mm)
(in)
Weight (g)
(oz)
Structure Waterproof (up to 1 meter for 10 minutes) and nitrogen gas purged
*MOA = Minute of Angle ** (at minimum magnication)-(at maximum magnication)
Model 4-12×40
94-94
3.7-3.7
25.4
1
50.3
2.0
44
1.7
1click: 1/4 in @ 100 yd
91.4
100
7.9-2.6
23.6-7.9
342
13.5
495
17.5
3. Instructions
(1) Focusing
1 Look through the eyepiece with your eye positioned about 4 in (10 cm) away from the eyepiece to see the BDC 800 reticle
(Fig. 3).
Be sure your eye is positioned with proper alignment and with proper eye relief, otherwise the view will “black out.”
2 Point the objective end of the scope at the sky (do NOT point it at the sun) or at a plain unpatterned wall.
3 Turn the eyepiece adjustment counter-clockwise and then turn it clockwise until the reticle appears sharp.
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BDC 800 Reticle
Fig. 3
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(2) Magnication
• The P-308 Riescope has variable magnication. For details, see “2. Specications”.
To change powers, just rotate the power selector ring until the desired magnication appears adjacent to the power index dot.
(4) Zero setting of the elevation and windage adjustment turrets
The elevation/windage adjustment turrets have a retracting system. After the reticle has been adjusted to the point of impact, pull out the adjustment turret. The adjustment turret can now be turned freely. Align
the zero number to the index line to set the zero setting, and then release the turret. The turret automatically retracts to the original position.
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(3) Adjustment of the riescope
Sighting through the riescope, align the rie with your aiming point on the target and shoot a trial round. If the bullet does not hit the aiming point, adjust the elevation and windage adjustment turrets as follows:
• If the bullet hits under the aiming point, turn the elevation adjustment turret (counter-clockwise) in the direction of the arrow marked “U” for up. If the bullet hits high, turn the elevation adjustment turret (clock-
wise) in the direction of the arrow marked “D” for down.
• If the bullet hits to the right of the aiming point, turn the windage adjustment turret (clockwise) in the direction of the arrow marked “L” for left. If the bullet hits to the left of the aiming point, turn the windage
adjustment turret (counter-clockwise) in the direction of the arrow marked “R” for right.
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Note:
• The windage and elevation scales of the P-308 Riescope 4-12×40 are calibrated in divisions of 1/4 minute of angle, with a click at intervals of 1/4 minute of angle.
• When adjusting the reticle to the point of aim, remember that 1 minute of angle equals approximately 1 in (2.54 cm) at 100 yd (91.44 m).
Therefore, if the impact point is 2 in (5.08 cm) low and 1 in (2.54 cm) right at 100 yd (91.44 m) parallax setting, you should adjust 2 minutes of angle up 1 minute of angle left.
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100 yds
250 yds
350 yds
450 yds
550 yds
650 yds
750 yds
800 yds
200 yds
300 yds
400 yds
500 yds
600 yds
700 yds
Utilizing the BDC reticle
Thank you for choosing the Nikon BDC reticle riescope. The BDC reticle is designed to compensate for the trajectory of your rearm. Regardless of the particular style of BDC reticle you have, the position of the circles are
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based upon an average trajectory for some of the more popular projectiles and cartridges on the market based upon the intended use of the scope itself.
Please note that the reticle is based upon ballistic information and may or may not meet the same results for you as there are many variables that come into play such as:
• Actual Velocity (Ammunition manufactures’ information in regards to muzzle velocity may or may not match the velocity your rearm produces. The best way to determine the actual muzzle velocity for your rearm
is to use a chronograph).
• Temperature
• Humidity
• Altitude
• Barometric Pressure
• Condition and inherent accuracy of the rearm
• The mounting system and how true it positions the scope to the centerline of the bore
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BDC 800
The BDC 800 reticle was designed specically for long range, heavy barrel AR platform ries using .308 Winchester with 168 grain hollow point
boat tail match grade ammunition with an approximate muzzle velocity of 2680 fps. The reticle is designed for a 100 yard zero, with alternating
circles, hash marks and dots that provide multiple bullet drop compensation aiming points out to 800 yards using the ammunition specied
above. The circles represent even number yardages (200, 400, 600 and 800 yards) while the dots represent odd number yardages (300, 500 and
700 yards) with the hash marks representing 50 yard increments between the circles and dots (250, 350, 450, 550, 650 and 750)
Please note the hash mark below the bottom circle as well as the pointed bottom vertical post can also be used for additional points of bullet
drop compensation.
Please note that your rearm may or may not match the information listed for bullet drop based upon the variables listed in this section.
What if your choice of round in your AR rie is a .308 Winchester 150 grain bullet at 2800 fps or a caliber other than the .308 Winchester? NO
PROBLEM, just go to the Nikon Spot On website (nikonsportoptics.com/Spoton) and you can match your exact cartridge to the reticle. In fact,
we highly recommend that you check out the Spot On website as it will provide exact yardages that each hash mark represents, providing
unparalleled ballistic data for long range shooting.
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BDC 800
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