OneZero Ballistics Calculator vs PrecisionLoad Suite

Zero your rifle with one load and know exactly where a second load will hit, without touching your sights. OneZero is a ballistic calculator for 139 cartridges, from .17 HMR to .50 BMG. Use it for supersonic and subsonic .300 Blackout, a match load and a hunting load, or any two rounds you shoot from one zero. SEE THE SHIFT • Pick a zeroed round and a Round 2, and both fly from the same zero. • The headline shows where Round 2 lands at your distance and the hold to correct it: "12.3 in low · Hold U 11.7 MOA". • The solution updates live as you type. No Calculate button. READ DOPE AT ANY RANGE • Drag across the trajectory chart for drop at any yard. The readout stays put when you lift your finger. • Pinch to zoom, and switch between drop and drift. • The dope card lists up, down, left and right corrections for both loads, plus the shift between them, in MOA or MIL. 4,266 FACTORY LOADS BUILT IN • Pick your rifle's cartridge and browse its factory loads, with published ballistic coefficients and muzzle velocities. • Many include bullet length for stability and spin drift, and a G7 ballistic coefficient where the bullet has one. • Search or filter supersonic and subsonic, then tap a load to use it as your zeroed round or Round 2. WIND FROM YOUR COMPASS • Use Current Weather fills in the wind's speed and the direction it blows from. • Tap Target Direction and point your iPhone at the target, and OneZero works out the wind's clock direction. You can still pick it by hand. ON YOUR WRIST • The Apple Watch app shows the elevation and windage holds for both rounds from your iPhone's setup. • Turn the Digital Crown to step through distances 5 yards at a time. • The windage holds follow the watch's compass, so you can face the next target and read the hold. • Today's sunrise and sunset sit beside the clock, and your setup stays on the watch when your phone doesn't. PHYSICS YOU CAN CHECK • Standard G1 and G7 drag tables indexed by Mach number, the same reference data used by established ballistic solvers. • Air density from station pressure, temperature and humidity, with density altitude and speed of sound shown. • Wind from any direction: crosswind drift by the lag-time method, and head and tail winds in the drag. The wind's clock direction is picked by hand or worked out from compass bearings. • Miller stability and spin drift from your cartridge's bullet diameter, bullet length and barrel twist, corrected for muzzle velocity and air density. • Coriolis from your latitude, with its vertical part for the target's direction. MADE FOR THE RANGE • Use Current Weather fills temperature, humidity, pressure, altitude and wind from Apple Weather for your location. • Save rifles and loads as presets and switch between them in a tap. • Share a PDF dope card with both loads, ready to print. • On iPhone Duo, see Setup and the live solution side by side, split at the fold. • Dark mode and full VoiceOver support. Always confirm your dope with live fire before relying on it. Weather data provided by Apple Weather.

PrecisionLoad Suite is a structured platform designed to guide users through the complete precision load development process (reloading) —from initial setup to final validation. Built for shooting sports enthusiasts and long-range precision users, the app provides a step-by-step system for organizing components, tracking results, and analyzing data to help you refine and optimize loads for your rifle. CORE EXPERIENCE • Guided Load Development Workflow Follow a structured, multi-step process that walks you through each phase of load development. Organize projects, track components, and document results in a clear, repeatable system. • Velocity & Ballistic Analysis Visualize velocity data, identify trends, and compare test phases using built-in charting tools. • Target Group Analysis Import target images and analyze shot group size, mean radius, and point of impact with precision. • Custom Target Builder Create and export printable targets tailored to your testing process. • Project-Based Reporting Generate detailed reports across all stages of load development. • AI-Assisted Insights Get contextual insights and explanations based on your recorded data to support decision-making. ADVANCED PLATFORM CAPABILITIES • Multi-Module System Seamlessly connect load development workflow, velocity analysis, and target evaluation within a unified platform. • Structured Project Management Organize complete data across rifles, components, and testing phases with detailed historical tracking. • Statistical Analysis Tools Identify trends, consistency patterns, and performance metrics using built-in analytical tools. • Cross-Linked Data Workflows Move between data collection and analysis seamlessly, with results flowing across modules for deeper insights. BUILT FOR PRECISION PrecisionLoad Suite is built for users who want a structured, repeatable approach to load development—combining organization, analysis, and guided workflow to support consistent results. NOTE This app is intended for data tracking, analysis, and workflow support only. Users are responsible for following all applicable safety standards and manufacturer guidelines. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/