Maximum "no hold-over" range?

[Naphtali]

I want to be able to hold on a zeroed [elevation] point of aim and have the bullet neither rise or fall from that point of aim more than 4 inches. The load propels a Saeco (O58 or 454) .452-inch 300-grain SWC-GC bullet @ 1600 fps.

I can achieve this, I think, using the "by guess and by gosh" method of moving my target until I find the maximum distance that my point of aim's elevation that drops less than 4 inches. I'm pretty sure there is a formula or set of tables that will make this job much easier and quicker, but I don't know what it is or where to find it.

Anyone who has a shortcut for finding this distance, please identify it for me.

[dualsport]

If you know the BC of your boolit there are numerous programs for calculating trajectories. IIRC, I used Hornady's website for that. They have a calculator program. Some reloading manuals have charts in the back giving that type of info. It's all about the BC and velocity. I used Hornady's program to site in a 30-06 at 100 yds. for a 1,000 yard zero. It worked. Something like 36" high at 100.

[WebMonkey]

Nikon spot on app is handy as pockets on a shirt for this.
Enter handload data and it'll calculate a full ballistics chart for you.
:)

[Blammer]

used to be a program called 'point blank' put in the data it kicks out the info you want.

can't find it on my 'puter anymore but do remember it.

[Blammer]

http://www.shooterscalculator.com/point-blank-range.php?df=G1&bc=0.48&vi=1600&sh=1&ts=4

try this

[Artful]

You can try this to estimate B.C.
http://tmtpages.com/calcbc/calcbc.htm

Once you find it you can put it for other to use in this thread
http://castboolits.gunloads.com/showthread.php?94638-Cast-Bullet-Ballistic-Coefficent-Table

I'd guess you'll find about 0.2 B.C., which should give 125 yards when sighted in at 107 yards.

[dverna]

http://www.shooterscalculator.com/point-blank-range.php?df=G1&bc=0.48&vi=1600&sh=1&ts=4

try this

target size is 8" not 4"

[country gent]

I believe Sierra's Infinity program has a point blank range calculator also. SOme other ballistics programs have both fixed range and point blank range

[Paul105]

Test -- zero 140yds, Max Point Blank w/8" hit zone (+- 4") = 166 yds

Using Point Blank Program

Load Data
~~~~~~~~~

Name: .454, 300gr, Ballistic Coeff: 0.200
Bullet Weight: 300
Velocity: 1600
Target Distance: 140
Scope Height: 0.500
Temperature: 70
Altitude: 4000

Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -0.50 in 1600 fps 1705 fpe 0.000 sec 0.00 in -0.50 in 0.00 in
25 yds 1.96 in 1532 fps 1563 fpe 0.048 sec 0.43 in -0.09 in 0.12 in
50 yds 3.50 in 1467 fps 1434 fpe 0.097 sec 1.78 in 0.26 in 0.62 in
75 yds 4.03 in 1406 fps 1316 fpe 0.150 sec 4.13 in 0.89 in 1.56 in
100 yds 3.44 in 1348 fps 1211 fpe 0.204 sec 7.61 in 1.83 in 2.95 in
125 yds 1.66 in 1294 fps 1116 fpe 0.261 sec 12.28 in 3.11 in 4.71 in
150 yds -1.39 in 1244 fps 1030 fpe 0.320 sec 18.21 in 4.78 in 6.83 in
175 yds -5.86 in 1198 fps 956 fpe 0.382 sec 25.57 in 6.88 in 9.40 in
200 yds -11.84 in 1156 fps 891 fpe 0.445 sec 34.44 in 9.44 in 12.37 in
225 yds -19.45 in 1119 fps 834 fpe 0.511 sec 44.94 in 12.50 in 15.73 in
250 yds -28.78 in 1086 fps 785 fpe 0.579 sec 57.15 in 16.11 in 19.45 in

[Geezer in NH]

Hornady loading manuals have this information.

[Naphtali]

Paul:

Great stuff. How much degradation of range should I expect with temperature at 30 degrees Fahrenheit? And what happens when altitude is 4500 feet rather than 4000?

I'm thinking that sight height of .500 inch is pretty much of a "push" - that is open sights and tang sight remain right about the same height over bore?
Test -- zero 140yds, Max Point Blank w/8" hit zone (+- 4") = 166 yds

Using Point Blank Program

Load Data
~~~~~~~~~

Name: .454, 300gr, Ballistic Coeff: 0.200
Bullet Weight: 300
Velocity: 1600
Target Distance: 140
Scope Height: 0.500
Temperature: 70
Altitude: 4000

Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -0.50 in 1600 fps 1705 fpe 0.000 sec 0.00 in -0.50 in 0.00 in
25 yds 1.96 in 1532 fps 1563 fpe 0.048 sec 0.43 in -0.09 in 0.12 in
50 yds 3.50 in 1467 fps 1434 fpe 0.097 sec 1.78 in 0.26 in 0.62 in
75 yds 4.03 in 1406 fps 1316 fpe 0.150 sec 4.13 in 0.89 in 1.56 in
100 yds 3.44 in 1348 fps 1211 fpe 0.204 sec 7.61 in 1.83 in 2.95 in
125 yds 1.66 in 1294 fps 1116 fpe 0.261 sec 12.28 in 3.11 in 4.71 in
150 yds -1.39 in 1244 fps 1030 fpe 0.320 sec 18.21 in 4.78 in 6.83 in
175 yds -5.86 in 1198 fps 956 fpe 0.382 sec 25.57 in 6.88 in 9.40 in
200 yds -11.84 in 1156 fps 891 fpe 0.445 sec 34.44 in 9.44 in 12.37 in
225 yds -19.45 in 1119 fps 834 fpe 0.511 sec 44.94 in 12.50 in 15.73 in
250 yds -28.78 in 1086 fps 785 fpe 0.579 sec 57.15 in 16.11 in 19.45 in

[Don Fischer]

I want to be able to hold on a zeroed [elevation] point of aim and have the bullet neither rise or fall from that point of aim more than 4 inches. The load propels a Saeco (O58 or 454) .452-inch 300-grain SWC-GC bullet @ 1600 fps.

I can achieve this, I think, using the "by guess and by gosh" method of moving my target until I find the maximum distance that my point of aim's elevation that drops less than 4 inches. I'm pretty sure there is a formula or set of tables that will make this job much easier and quicker, but I don't know what it is or where to find it.

Anyone who has a shortcut for finding this distance, please identify it for me.

Post the bullet BC and weight and velocity and I can run it through my chrpmpgraaph and get you the distnces. My 180gr 30 cal at 1800fps gives a NPBR at an 8" target, *' is what you want. at I think it was 176yds. At 100yds it is 2.75" high.

[Don Fischer]

Paul:

Great stuff. How much degradation of range should I expect with temperature at 30 degrees Fahrenheit? And what happens when altitude is 4500 feet rather than 4000?

I'm thinking that sight height of .500 inch is pretty much of a "push" - that is open sights and tang sight remain right about the same height over bore?

This data falls just out of the 8" target at 75yds and is almost 2" below the PBR for an 8" target at 175yds.

[Paul105]

Paul:

Great stuff. How much degradation of range should I expect with temperature at 30 degrees Fahrenheit? And what happens when altitude is 4500 feet rather than 4000?

I'm thinking that sight height of .500 inch is pretty much of a "push" - that is open sights and tang sight remain right about the same height over bore?

Zero = 139 yds
Max Point Blank Range = 165 yds

Insignificant!

Paul

[bman940]

One of the cool things about using Nikon's Spot On Ballistic's Program is you can enter all your load data, click on a scope with a Nikoplex reticle and then click on optimize load data. This allows you to pick a vital's zone for your target where you will still make impact withno adjustments. Very easy to do and the more accurate the info you enter the more accurate your results will be. All this info is free too.
http://i1216.photobucket.com/albums/dd363/bman940/Screen%20Shot%202016-10-11%20at%209.52.57%20AM.png