Within Range

Your field notebook

My Practice

Log a session +

Save rifle and ammunition setups, then record position-matched practice sessions. Your data stays in this browser unless you export it.

A practice record is evidence, not a guarantee. Comparisons remain descriptive and this version does not add an unvalidated recency adjustment.

Your custom loads

For established factory or handloaded ammunition. Within Range uses your projectile, BC and velocity for external ballistics; it does not assess chamber pressure, recommend charges or certify a load as safe.

No custom loads saved. Add one below to use it in Calculator, Practice and DOPE.
Add a custom load
Only hunting projectiles are available for deer placement calculations.
Use the BC and drag model published for this exact projectile.
Your muzzle velocity

Use a measured value when you have one. This value drives the trajectory directly.

Manufacturer figures are a starting point, not a measurement from your rifle.
Chronograph sample details (optional)
Record measured values only. Blank does not mean zero variation.
Recordkeeping only once muzzle velocity is entered. It does not change the trajectory calculation.
Private component notes

Recordkeeping only. These fields do not affect any calculation and are not checked as a safe loading combination. Record only an established load you already use in accordance with reliable published loading data.

Your rifle setups

Start by adding your rifle and ammunition below. You can then log groups against that setup.

Add a rifle setup

Session history

Your most recent sessions appear first. Each record keeps its original measurements and context.

No practice sessions saved yet. Add a rifle setup, then log your first group to start your record.

Log a practice group

Measure groups centre-to-centre. Width and height are both kept; their bounding-box diagonal is used as a conservative upper estimate of extreme spread. Do not omit a poor group; record any excluded shot and the reason.

Add a rifle setup if you need another one.
Record more evidence (optional)

Nothing here is needed to save a group. Extra detail is kept with the record so later versions of Within Range can model your shooting more closely. It does not change today’s calculator results.

Evidence in this record

    A list of what will be saved, not a rating of the group or the shooter.

    Conditions and notes
    The wind you’d enter in the calculator for this group.
    Same range session

    Groups fired on one visit to the range share that day’s conditions, so they aren’t separate range days. Tick this for each group from this visit and they’ll be kept together. Leave it unticked if you’re not sure.

    No range session started yet. The next ticked group starts one.

    Aim point and first shot

    Offsets are measured on the target from your aim point, in millimetres. Right and high are positive; left and low are negative.

    Negative is left; positive is right.
    Negative is low; positive is high.
    Do you know where the first shot of this group landed?
    Was that first shot from a cold bore?
    Wind call

    Compares your wind call with a reference reading. Make your call and write it down beforeyou check a meter or ask anyone, then record the reference.

    1. My call
    2. Reference wind
    A reading at the firing point is a reference, not the wind along the whole bullet path.
    Direction is where the wind blows from: 12 o’clock from the target, 3 o’clock from your right.
    Shot placement

    Mark where each counted shot landed relative to your aim point, in the order fired. Shot 1 is the first shot and must match the first-shot entry above if you gave one. Leave out excluded shots. Tapping the grid places a shot roughly; correct the numbers from your measured target.

    Photograph the target with a printed square or rectangle of known size on the same sheet. You mark its corners, your aim point and each hole; the shot positions, width, height and extreme spread are filled in for you to check. The photo stays on this device and is not saved.

    The centre-to-centre distance between the two shots farthest apart, measured directly. This is not the same as width or height, and the calculator does not use it yet.
    Environment
    Station pressure is the actual pressure where you shot, as a meter reads it. A forecast’s sea-level pressure is a different number.

    Create a guided practice drill

    A drill holds setup, distance, position and shot count constant. The six-group default creates two descriptive three-group windows; it is not a validated minimum for capability. Record every group, including poor ones.

    No guided drills saved yet.

    Practice progress and position comparison

    For evidence grouped by position, load and range session, see My Capability.

    Positions appear together only when setup, practice distance and shot count match. The recent-versus-previous view compares two three-group medians and is descriptive; it does not prove a durable change in capability.

    No compatible groups are available to summarise yet.

    Backup and restore

    Your records are saved on this device and browser. Export a backup before clearing browser data or moving devices. Import replaces the practice data currently saved in this browser.

    Edit My Practice in one tab at a time. A tab left open while you save elsewhere will normally refuse to save and ask you to reload, but two tabs saving at almost the same moment can still lose one change.

    After exporting, check your Downloads or Files app and keep the JSON file somewhere you can find it. The site cannot confirm that a download was saved.

    Measure a group from a photo

    The photo stays on this device and is discarded when this closes. Only the measured positions you choose to use are kept.

    Use a printed square or rectangle on the same sheet, such as a target’s grid square. Measure its printed size with a ruler if you can: a larger rectangle near the group measures more accurately.

    Press near a point and slide to fine-tune it; the magnifier shows exactly where the mark goes. Lift to mark. With a keyboard, use the arrow keys (Shift for bigger steps) and Enter.

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