Rifle Sight-in Question?
By spotter ~ December 28th, 2008. Filed under: Nikon Scopes.
C J asked:
In this area, it is difficult to find an outdoor range that gives me 100 yards to sight in. I'm forced, temporarily, to use a 25 yard indoor range. My scope is boresighted for 100 yards, and I would like to dial in to 100 yards. If I sight my scope for 25 yards, how much adjustment would need to be made to zero to 100 yards? I realize at this short distance, the bullet is rising, and then a progressive drop from 100 yards, and on.
In this area, it is difficult to find an outdoor range that gives me 100 yards to sight in. I'm forced, temporarily, to use a 25 yard indoor range. My scope is boresighted for 100 yards, and I would like to dial in to 100 yards. If I sight my scope for 25 yards, how much adjustment would need to be made to zero to 100 yards? I realize at this short distance, the bullet is rising, and then a progressive drop from 100 yards, and on.
I am using a Remington 710, .30-'06, a Nikon 3x9x BDC scope. MOA is 1/4" per click. I am using Remington 165gr. Core Lokt's.
Any help is appreciated.
December 31st, 2008 at 4:15 am
You need a ballistic program. check out:
With these programs you can feed in data about your bullet and it will give you trajectories for various distances.
January 2nd, 2009 at 7:38 pm
God only knows, but if you can chrono a ten-shot string and sight it an inch or so low at 25, you should be able to calculate point blank range (much better than sighting in for 100 yards) and be on paper when you get where you’re going. Make sure the cartridges you take hunting are from the same lot as those you do your preliminaries with.
January 6th, 2009 at 6:49 am
Realize that until you punch a hole in paper at 100 yds,this is just theory.How tall are the bases?See-thru bases will mess you up on this one because they are so tall.Assume anything else,Weaver,Leupold,etc.—it is a little easier.Oh,yeah,no bullets ever “rise”.All bullets fall at the same rate–9.8m/sec/sec.Drop a quarter.Thats how fast your 30/06 drops.Your 30/06 covers about 2,800 ft,while your quarter covers 0.The bullet crosses your “line of sight” at about 25 feet,stays above until wherever you zero.The barrel and scope(sight-line) are NOT parallel.At 25 yds your scope is 1/16MOA,so zeroing is really impossible.You should be less than 1.5″ high at 25 yd.Can’t hunt ethically till you shoot 100,though.Look into “drop” for sure,until you really do understand it.Bullets don’t escape gravity.Compare it to line of sight,if your gunsmith thinks I’m crazy—get a new gunsmith and tell him to fix cars instead!Good luck!
January 8th, 2009 at 2:02 pm
A 150 grain bullet on your “06″ sighted in dead on at 25 yds will be about 1″ high at 100 yds– 11/2″ high at 175 yds. and back dead on at 200 yds. Go to a 165 gr. power point or Nosler for deer. You still need to group 3 rounds at 100yd.
Bigbair70——–Never let them see you sweat!!!!!!!!!
January 9th, 2009 at 9:11 am
Trajectory for Remington .308 dia. 30-06 Spgfld, 165 gr. PSPBT at 2800 FPS.
At an Elevation Angle of: 0 degrees
Ballistic Coefficents of: 0.437 0.437 0.437 0.437 0.437
Velocity Boundaries (Feet per Second) of: 2240 2240 2240 2240
Wind Direction is: 3.0 o’clock and a Wind Velocity of: 10.0 Miles per hour
Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0
Altitude: 0 Feet Humidity: 50 percent Pressure: 29.53 in/Hg
Temperature: 59F
Range Velocity Energy Momentum Drop Bullet Path
(Yards) (Ft/Sec) (Ft/Lbs) (Lb-Sec) (inches) (Inches)
0 / 2800.0 / 2871.9 / 2.05 / 0.0 / -1.5
25 / 2747.1 / 2764.3 / 2.01 / -0.14 / -0.68
50 / 2694.8 / 2660.1 / 1.97 / -0.57 / -0.15
75 / 2643.1 / 2559.1 / 1.94 / -1.3 / 0.08
100 / 2592.0 / 2461.1 / 1.90 / -2.33 / 0.0
CJ the above information is from “Sierra Suite 5″ reloading and ballistics program. It uses Remington’s “stated” velocity for their factory ammo. Assuming your rifle has the same barrel length. It also assumes your site height is 1.5″
Like the other gentlemen have stated untill you put it on paper you can’t hunt ethically,yet this program has proven to be an excellent starting point for my rifles. Like they stated it’s theory and the programs assume a lot. (We both know what assuming does) It makes an ass/u/me. So try this it should get you on paper at 100 then you can fine tune from there.
Good Luck and Good Shooting!! FireMedic09
January 12th, 2009 at 1:47 pm
THe info that fire medic gave is actually the best- give him the 10 points
I’m just including a link for free ballistics software, drag tables, ranges and so forth from a good sniping website.
These are good programs:
But this one is the bees-knees: