The Ballistic Velocity Analyzer is a multi-load velocity comparison tool
that applies formal statistical methods to chronograph data. Rather than relying on gut feel or eyeballing
extreme spread and standard deviation, BVA uses Welch's ANOVA and
Brown-Forsythe tests with Games-Howell post-hoc
comparisons to determine whether the velocity differences between loads are real or just noise.
BVA answers the question every handloader asks after a range session:
are these loads actually different, or am I chasing sample-size artifacts?
WHY IT MATTERS
Standard deviation and extreme spread are useful at a glance, but they tell you nothing about whether
one load is statistically distinguishable from another. A 5-round SD of 8 fps does not mean
the load is better than one with an SD of 12 — the sample sizes involved in typical load development
are too small for raw summary statistics to be reliable on their own.
BVA applies hypothesis testing to give you a p-value for each pairwise comparison,
along with effect sizes and confidence intervals.
This lets you make informed decisions about which loads to pursue and which to discard — backed by math, not intuition.
WORKFLOW
01 — CARTRIDGE
Identify the cartridge and platform. Barrel specs, action type, and muzzle device are recorded for the report.
02 — LOADS
Define up to 20 loads with bullet, powder, primer, and brass details. Each load gets a letter designation (A–T) for easy reference.
03 — DATA IMPORT
Enter velocity strings manually or import from CSV, MagnetoSpeed, LabRadar, or Garmin Xero C1. Assign each string to a load.
04 — SESSION INFO
Record environmental conditions, range location, and session date. This metadata is included in the final report.
05 — REPORT
Generate a publication-ready report with per-load statistics, ANOVA results, pairwise comparisons, and optional hit probability and velocity retention analysis.
KEY FEATURES
Welch's ANOVA — omnibus test for velocity differences across all loads simultaneously
Brown-Forsythe — robust alternative that does not assume equal variances
Games-Howell Post-Hoc — pairwise comparisons with confidence intervals
Hit Probability — estimate hit percentage on a given target size at range using per-load velocity consistency
Velocity Retention — downrange velocity curves using G1/G7 drag models via the shared ballistic solver
Session Sharing — generate a share link to send your full session to anyone, no account required
Device Import — direct import from MagnetoSpeed, LabRadar, Garmin Xero C1, and CSV files
Export / Import — save and reload complete sessions as .bva files for archival or transfer
When BC and bullet weight are provided, the report will include a downrange trajectory analysis showing how velocity SD and ES affect vertical spread, hit probability, and energy retention at distance.
DEFAULT COMPONENTS — used for all loads unless overridden per-load · all optional
POWDER DEFAULT
BULLET · BRASS · PRIMER DEFAULTS
DEFAULT WEATHER — pre-fills weather fields on new loads · all optional
DEFINE UP TO 20 LOADS · ALL FIELDS OPTIONAL EXCEPT MUZZLE VELOCITY · BLANK FIELDS INHERIT CARTRIDGE DEFAULTS
CSV FILE IMPORT
CSV FORMAT: One column per load. First row = load label (e.g. "Load A" or "N568"). Subsequent rows = velocity values in fps.
Example: columns A, B, C = Load A velocities, Load B velocities, Load C velocities.
Load A,Load B,Load C
3021.9,3100.2,3036.8
3035.4,3085.6,3034.6
3021.7,3099.0,3045.4
...
📂
CLICK TO SELECT CSV FILE
or drag and drop here · .csv files only
OR PASTE DATA MANUALLY
Velocity data can also be entered directly in each load's text area on the LOADS tab.
Enter one velocity per line, or comma/space separated values.
CURRENT DATA STATUS
SAMPLE SESSION FILE
Download a sample .bva session file to see how BVA works. Import it using the IMPORT SESSION button in the toolbar above.
RANGE LOCATION AND SESSION NOTES WILL APPEAR IN THE REPORT HEADER.
WEATHER CONDITIONS ARE ENTERED PER LOAD ON THE LOADS TAB — THIS ALLOWS COMPARING THE SAME LOAD AT DIFFERENT TEMPERATURES OR ATMOSPHERIC CONDITIONS.
RANGE LOCATION
SESSION NOTES (optional)
🎯
CONFIGURE CARTRIDGE AND LOADS, THEN CLICK "GENERATE REPORT"