Rifle Zeroing Question

[pbwalker]

So I know if you zero .270 at 25 yards dead on with 130 grain bullets it will be about 3 inches high at 100 yds...and there is a similar formula for .30-06.

My question is, do they have all this info some place? I'm shooting 150 grain .270's and would like to tweak my rife out at the lease tomorrow, but really don't want to have to measure out 100 yards as there really aren't too many long ranges with unobstructed views.

I know there are a lot of variables, but I'm just looking for a rough guide.

[tacticool]

Some of the big ammo manufacturers have charts (or even ballistic calculators) for their ammo on their websites.

[pbwalker]

Yeah, and all they seem to give is '0' @ 100. I'm looking for something that will give a "chart" style of info, basically saying something like "If you zero at 25 yards, you will be <##> high at 100, <##> at 150, etc.

[JJVP]

So I know if you zero .270 at 25 yards dead on with 130 grain bullets it will be about 3 inches high at 100 yds...and there is a similar formula for .30-06.

My question is, do they have all this info some place? I'm shooting 150 grain .270's and would like to tweak my rife out at the lease tomorrow, but really don't want to have to measure out 100 yards as there really aren't too many long ranges with unobstructed views.

I know there are a lot of variables, but I'm just looking for a rough guide.

Go to Winchester site and use the ballistic calculator

http://ballisticscalculator.winchester.com/" onclick="window.open(this.href);return false;

[NcongruNt]

This one works well, also. You can give it the zero, and will give you drop calculations every 10y:

http://www.handloads.org/calc/index.html" onclick="window.open(this.href);return false;

[tacticool]

For example, http://ballisticscalculator.winchester.com/" onclick="window.open(this.href);return false; says

Sight-in Range: 25 yds Max Range: 200 yds
Altitude: 1000 msl Sight Height: 1.5 in
30-06 Springfield 125 gr. Super-X® Pointed Soft Point
Ballistic Coefficient: 0.268 - Muzzle Velocity: 3140

Code: Select all

DISTANCE          LINE-OF-SIGHT DROP	
0	                    -1.5
20	                    -0.3
40	                    0.7
60	                    1.6
80	                    2.3	
100	                    2.8	
120	                    3.2
140	                    3.4
160	                    3.3
180	                    3.1
200	                    2.6

[pbwalker]

This one works well, also. You can give it the zero, and will give you drop calculations every 10y:

http://www.handloads.org/calc/index.html" onclick="window.open(this.href);return false;

Perfect! Thanks so much!

Hope things are well for ya in A-town!

[pbwalker]

For example, http://ballisticscalculator.winchester.com/" onclick="window.open(this.href);return false; says

Sight-in Range: 25 yds Max Range: 200 yds
Altitude: 1000 msl Sight Height: 1.5 in
30-06 Springfield 125 gr. Super-X® Pointed Soft Point
Ballistic Coefficient: 0.268 - Muzzle Velocity: 3140

Code: Select all

DISTANCE          LINE-OF-SIGHT DROP	
0	                    -1.5
20	                    -0.3
40	                    0.7
60	                    1.6
80	                    2.3	
100	                    2.8	
120	                    3.2
140	                    3.4
160	                    3.3
180	                    3.1
200	                    2.6

Thanks so much!

[CaptWoodrow10]

Bookmarking for future use. Interesting resource.

[NcongruNt]

This one works well, also. You can give it the zero, and will give you drop calculations every 10y:

http://www.handloads.org/calc/index.html" onclick="window.open(this.href);return false;

Perfect! Thanks so much!

Hope things are well for ya in A-town!

You're welcome.

I can't complain, just got my AR build completed and running this past week. I actually used the calculator I linked to you to figure out that 50 yards is about the same as 200 yards for sighting with standard A2-height AR sights.

[Vecco]

So I know if you zero .270 at 25 yards dead on with 130 grain bullets it will be about 3 inches high at 100 yds...and there is a similar formula for .30-06.

My question is, do they have all this info some place? I'm shooting 150 grain .270's and would like to tweak my rife out at the lease tomorrow, but really don't want to have to measure out 100 yards as there really aren't too many long ranges with unobstructed views.

I know there are a lot of variables, but I'm just looking for a rough guide.

Go to Winchester site and use the ballistic calculator

http://ballisticscalculator.winchester.com/" onclick="window.open(this.href);return false;

If you ghave a Iphone or other device that runs " Apps" you can DL the winchester one for free. Nice to have on trips or at the range.

[MechAg94]

I can understand if you don't have the longer range available to shoot, but the level of precision sighting in at 25 yards is no where near what you would get at 100 or more yards. Unless you are extremely precise, I think you would be lucky to make minute of deer accuracy at distance.

That said, that calculator is interesting. Might come in handy when using my laser bore sight and doing my short range test shots.