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sighting question

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Bloodknight

Master Class
Founding Member
There's a lot of info out there, but I believe we have a lot of good knowledge on this forum. So here goes. I have an area to sight in just over 50 yards. I have a new Ruger 8500 model 5;56.I'm using Sig Sauer 77 grain ammo (my choice, no remarks please) If I sight in at 50 yards, what will the approximate drop of the bullet at 100 yards and 200 yards. I believe if we are talking about a center target shot. The drop would be nominal. For example, say a 12" target.I have heard the Marines are using something similar to this.
 
Using a scope?
Sight height above the bore centerline will make a difference.
Weather conditions and altitude above sea level will also make small changes.

I use this online ballistic calculator-
SIG 5.56 77 gr 50 yard zero

Using the SIG 77gr 5.56 ammo at 2750 fps, ballistic coefficient of 0.362 with a scope mounted 1.5" over the bore centerline.

A 50 yard zero will be about 1/4" high at 100 yards.
it will be about 0.90 low at 150 yards.
it will be about 3.35" low at 200 yards

A 150 yard zero would be:
About 0.30" high at 50 yards (your sight in distance)
0.83" high at 100 yards
0.00" at 150 yards
2.32" low at 200 yards.
 
for my 308 s i use a laser in the breach and set across the street in neighbors driveway, and sighted in 50 yards as dead center on the scope, late at night . so i can see the red line really well

i try to stay within 50 to 100 yards, for a "target, hog, etc" so if its close to 100 i dial up a click and it works well
the article up there is pretty darn good

my input is use a laser bore sight, with rifle firmly gripped in mount holder , to avoid wasting ammo and then you get to range and tweak it once your body is added to the equation.
 
Bloodknight said:
There's a lot of info out there, but I believe we have a lot of good knowledge on this forum. So here goes. I have an area to sight in just over 50 yards. I have a new Ruger 8500 model 5;56.I'm using Sig Sauer 77 grain ammo (my choice, no remarks please) If I sight in at 50 yards, what will the approximate drop of the bullet at 100 yards and 200 yards. I believe if we are talking about a center target shot. The drop would be nominal. For example, say a 12" target.I have heard the Marines are using something similar to this.
Click to expand...
At 100 yards you'll be a little high at 200 you'll be back on. Theoretically.

Bullet won't start dropping until 200 yards.
 
shanneba said:
Using a scope?
Sight height above the bore centerline will make a difference.
Weather conditions and altitude above sea level will also make small changes.

I use this online ballistic calculator-
SIG 5.56 77 gr 50 yard zero

Using the SIG 77gr 5.56 ammo at 2750 fps, ballistic coefficient of 0.362 with a scope mounted 1.5" over the bore centerline.

A 50 yard zero will be about 1/4" high at 100 yards.
it will be about 0.90 low at 150 yards.
it will be about 3.35" low at 200 yards

A 150 yard zero would be:
About 0.30" high at 50 yards (your sight in distance)
0.83" high at 100 yards
0.00" at 150 yards
2.32" low at 200 yards.
Click to expand...
Most Excellent! Thanks so much. Copied this for range day.
Bassbob said:
At 100 yards you'll be a little high at 200 you'll be back on. Theoretically.

Bullet won't start dropping until 200 yards.
Click to expand...
Thanks so much for your reply !
 
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