Guys

I know there are many things to take into consideration, but generally speaking..........if I wanted to sight in a .223 at 50m so that it ends up at the equivalent of say 2" high at 100, how should I do that? Spot on at 50?, high?, low? by how much?

53gn TSX using 25 gr of RL15.

Sorry to lay this on you but 50m is all I have available and I'm in a hurry.

Cheers.

GG

half inch low at 50

Cheers old mate.

GG

If it were dead on at 25m it would be very close to dead on at 100m(this is a basic "rule"). Sighted this way it would be high at 50m.

I would think you would want to be about .5" to 1" high at 50m to be 2" high at 100m.

If you were half an inch low at 50m, as suggested above, you are going to be even lower at 100m.

Jason,
I think that it has to be low at 50. I sight most of my hunting rifles a little low at 50 to get on paper. They are always a little high at 100. Your rifle is aimed in an upward plane and not flat.
Butch

What I am basing my figures on is the "rule of thumb" that a rifle with the scope mounted 1.5" above the bore and sighted to hit dead on at 100 yards will usually hit dead on at 25 yards.

I might be misremembering this rule. Could it be, "dead on at 25y = dead on at 200y"?

308 Win, Federal Match 168 and Black Hills Match 175, if sighted dead-on at 50 yds, will hit within 1/2" of dead-on at 200 yds, in a rifle with "standard" barrel length and scope positioning above bore axis.

The 223's faster, but the above-mentioned 308 bullets have higher BCs than the usual 223 projectile. Will the 223 approximate the trajectory of the 308 to 200 yds? I'll bet it'd be close enough to hit.

Dave Manson

Dead on at 50m would be my vote. For the psycoligical benefits. You might find yourself with a 50m shot.

+1 for zero'd at 50 yards. It seems to work well with both iron and scope sighted rifles.

i have learned and always thought that dead on at about 35 is dead on at about 100 with most average hunting cartridges, which would coincide with a bit low at 50. that said, for hunting accuracy i would think either would be plenty close unless your round is a real slouch, which a .223 is not. accordingly, the 50 yrd. zero should put you a few inches high at 100, which is what you were looking for.

If you have quickload, you have quick target, and to answer your question, it will want to know how high the center of the scope is above the center of the bore.

try

http://www.eskimo.com/~jbm/cgi-bin/jbmtraj-5.0.cgi

This is using 3000fps (as a guess)

Trajectory
Input Data
Manufacturer: Barnes Description: Triple-Shock™ X Flat Base
Caliber: 0.224 in Weight: 53.0 gr
Ballistic Coefficient: 0.204 G1
Muzzle Velocity: 3000.0 ft/s Distance to Chronograph: 10.0 ft
Sight Height: 1.50 in Sight Offset: 0.00 in
Zero Height: 2.00 in Zero Offset: 0.00 in
Windage: 0.000 MOA Elevation: 0.000 MOA
Line Of Sight Angle: 0.0 deg Cant Angle: 0.0 deg
Wind Speed: 10.0 mph Wind Angle: 90.0 deg
Target Speed: 10.0 mph Target Angle: 90.0 deg
Temperature: 59.0 °F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft
Vital Zone Radius: 5.0 in
Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Zero at Max. Point Blank Range: No Target Relative Drops: Yes
Mark Sound Barrier Crossing: No Include Extra Rows: No
Round Output to Whole Numbers: No
Output Data
Elevation: 5.382 MOA Windage: 0.000 MOA
Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.5 ft/s
Maximum PBR: 313 yd Maximum PBR Zero: 270 yd
Range of Maximum Height: 155 yd Energy at Maximum PBR: 347.2 ft•lbs
Sectional Density: 0.151 lb/in²
Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3016.2 2.702 1070.4 0.000 0.0 ***
25 -0.2 -0.8 0.1 0.3 2896.2 2.594 986.9 0.025 4.5 17.1
50 0.8 1.6 0.4 0.7 2779.4 2.489 909.0 0.052 9.1 17.4
75 1.6 2.0 0.8 1.1 2665.7 2.388 836.1 0.079 14.0 17.8
100 2.0 1.9 1.5 1.5 2554.9 2.288 768.0 0.108 19.0 18.2
125 2.1 1.6 2.4 1.9 2446.7 2.191 704.4 0.138 24.3 18.6
150 1.9 1.2 3.6 2.3 2341.2 2.097 644.9 0.169 29.8 19.0
175 1.2 0.7 5.0 2.7 2238.2 2.005 589.4 0.202 35.6 19.4
200 0.1 0.1 6.6 3.2 2137.7 1.915 537.7 0.236 41.6 19.9
225 -1.4 -0.6 8.6 3.6 2039.9 1.827 489.6 0.272 47.9 20.3
250 -3.5 -1.3 10.8 4.1 1944.7 1.742 445.0 0.310 54.6 20.8
275 -6.2 -2.2 13.4 4.6 1852.3 1.659 403.7 0.350 61.5 21.4
300 -9.5 -3.0 16.3 5.2 1763.0 1.579 365.7 0.391 68.8 21.9

I know the table probably doesn't show up right, but it sez you need to be 0.8 above at 50 to be 2" high at 100. It also says this would be almost nuts on at 200.

-nosualc

A .224, 50gr. Speer spitzer soft point with a muzzle velocity of 3300 fps., at muzzle will be -1.5", at 50yds., will be -0.30" and at 100 will be 0.00". roger

Jack O'Connor had a rule for sighting in a hunting rifle. It was printed countless times in Outdoor Life and other shooting publications. Just about every shooter was familiar with it.

For a scoped rifle, sight in nuts-on at 25 yards. For iron sights, nuts-on at 12 1/2 yards. With most modern high intensity cartridges this will put you 2 to 3 inches high at 100 yards and back on at 225 to 250. For grand-daddy's 30-30 you will be 1 to 1/12 inches high at 100 and back on at 150.

Those are just about perfect for 99% of all hunting. Verify and fine tune on a target, of course.

If you don't know who Jack O'Connor was, or if you do all you're hunting at 1200 yards, you're on your own.

Ray

With today's scopes' wider objective lenses and requisite taller rings I find the traditional 25 yard zero can put a group four to six inches high at 100. At our gun club's public deer rifle sight-in weekends every October we've had much better luck with a spot on 50 yard zero putting the usual high intensity rifle cartridges a inch or two high at 100 and about on at 200 (hard to tell the way most fellas shoot).

quote:

this will put you 2 to 3 inches high at 100 yards and back on at 225 to 250.

275 yard POI with Winchester factory loads. (Page 258 Big Game Rifle)
Factor of 4 for being off at 25yds. 1 inch = 4 inches at 100