creating a rimfire dope chart manually?

[Mystic Precision]

Ummmm... I dunno about that. There is so much that a machine doesn't "see".

Jerry

 

[old303]

A computer model will have to be reconciled to DOPE from some quality time behind the trigger. If the computer model is tuned to tell you the same answers that actually worked in the past, then there's a good chance you can interpolate to intermediate distances you haven't engaged before, or cautiously extrapolate a bit beyond prior experience.

 

[boxhitch]

Unfortunately (fortunately) not all of us have ''smart'' fones
or know how to use them.

I'm fairly analog .
...skwerl

don't think I will ever be tethered to a smart phone, but I may carry a tablet around to try and fit in )

Real time data from your gun, ammo and your location, bumps all computer fake output print outs. Manual cards made for your gear and your ammo and your location is trump! its real and proven. computers just get you close.

considering all the data points that have to be inputted and then may have to be adjusted to fit real world, manual data just seems more intuitive , guess I'm old school

 

[boxhitch]

Manual cards work for one set of atmospheric conditions, computers can adjust for altitude and temperature.

Sure, but with experience real world can be extrapolated too

Seems pretty simple using Mils
The number of mils equals the amount of bullet drop times 1000, divided by the distance to target
1 Mil = 10 cm @100 m
1 Mil = 20 cm @200 m.

i.e.
if Distance: 200 meters – Bullet drop = 14 centimeters – Mil adjustment = 0.7
if Distance: 500 meters – Bullet drop = 242.3 centimeters – Mil adjustment = 4.8

more mil stuff
FORMULA: CALCULATE 1 MIL SIZE AT ANY DISTANCE (CM)
Distance / 10 = 1 mil size at that distance
For example: 1250 meters / 10 = 125 cm
1 mil at 1250 m = 125 cm

FORMULA: TO CALCULATE METERS TO TARGET
(Target size in cm x 10) / mil size = meters to target

FORMULA: TO CALCULATE FOR target SIZE IN CM
(Distance in meters x mil size) / 10 = size (cm)

having fun yet

 

[Mystic Precision]

Manual cards work for one set of atmospheric conditions, computers can adjust for altitude and temperature.

Ever checked to see how much the DA changes in one location over a given day? Over many days?

Have you compared this change to the affect on the drop over 300m?

how does this change compare to the vertical size of common targets?

how does all this compare to the affect of a 5mph wind changing 45deg, 90deg, 120deg, 180deg relative to your firing line?

I have offered these points a number of times over the years just to see if anyone would be willing to actually understand what their environment is doing on any given day. so far, no one has come back with some data... pity, cause the machine just ain't going to see a whole lot.

Jerry

 

[dan belisle]

Ever checked to see how much the DA changes in one location over a given day? Over many days?

Have you compared this change to the affect on the drop over 300m?

how does this change compare to the vertical size of common targets?

how does all this compare to the affect of a 5mph wind changing 45deg, 90deg, 120deg, 180deg relative to your firing line?

I have offered these points a number of times over the years just to see if anyone would be willing to actually understand what their environment is doing on any given day. so far, no one has come back with some data... pity, cause the machine just ain't going to see a whole lot.

Jerry

Yes, a data table will have limitations, I agree. But it will give you a baseline, can be easily modified for environmental, firearm, etc conditions. I think the usefulness of what you learn outweighs any detriments. - dan

 

[uphill7152]

I've done something like this at a rim fire league.

The match director set targets out for our zeroing session. Target had something like 10 dots all 1" apart vertically and were numbered from 0-10.

Idea was to fire a 10 shot group at 50yrds, then switch to the 100yrd target to fire a second 10 shot group at the '0'. Whatever number you grouped near was your drop for 100yrds.

For what it's worth, the data matched Strelock Pro almost perfectly. So you could just do that if you bought it before they banned it.

 

[emerson]

Yes, a data table will have limitations, I agree. But it will give you a baseline, can be easily modified for environmental, firearm, etc conditions. I think the usefulness of what you learn outweighs any detriments. - dan

The learning is certainly useful for education value, but not useful in a match situation. Like manually calculating everything for an engineering problem, a paper dope chart is not sound 22 to 300 match work.

 

[Big Bad]

The best place to store such info is in your head but for convenience and refreshing my memory, I like a notebook. These Rite In The Rain notebooks are swell, and truly weatherproof. I suppose you don't really need the pre-printed pages you get with the 'Dope' version of the notebooks (meaning shooting dope), but they add an air of professionalism, if that's the right word.

https://www.riteintherain.com/no-d746-dope-logbook#D746

Edit: here's a review from Sniper's Hide:

https://www.snipershide.com/shooting/threads/rite-in-the-rain-dope-logbook.7061273/

 

[boxhitch]

Found my best bet is to use shooterscalculator and build a table with 5 yd increments to 400 = 366 m.
it has ability to add wind and elevation and temp and other parameters
uses imperial measure but can add a column for meters and then needed to change my zero accordingly, used 55 yds = 50 m.

one could use this to play with varying parameters and realize the effect