Zero It, Then True It: Making Your Data Match Reality

A ballistic solver is a model. Reality is the rifle, the lot of ammo, and the air in front of you. The shooters who hit first-round at distance aren't the ones with the fanciest app — they're the ones whose data has been trued to their own impacts. Here's how to get there.

Start with a confident zero

Everything downrange is referenced to your zero, so it has to be solid. A wandering zero poisons every solution above it.

• Shoot off a stable platform. Bags or a bipod and rear bag, not a wobbling hold. You're testing the rifle, not your offhand.
• Use groups, not single shots. Zero to the center of a 3–5 round group. One flier should never move your turret.
• Pick a distance and commit. 100 yards (or 100 m) is the common reference. Tell Strelok the exact zero range and your sight height.
• Confirm it twice across two range trips before you trust it. A zero that repeats on a different day is a real zero.

Get the best muzzle velocity you can

Muzzle velocity drives drop. A 30 fps error you'd never notice at 300 yards becomes a real miss at 1000. Chronograph your actual load if you possibly can — and average a string of shots, not one. If you can't chronograph, start with the manufacturer's figure and plan to correct it by truing.

Truing: bending the model to your bullets

Truing means shooting at a known distance well into your trajectory and adjusting your inputs until the solver predicts the elevation you actually needed. Two inputs do the heavy lifting:

1. True muzzle velocity at mid-range

Pick a distance where the bullet is still comfortably supersonic — often somewhere around 400–600 yards depending on the cartridge. Record the come-up that put you on center. In Strelok, nudge muzzle velocity until the predicted elevation matches what you dialed. This corrects the bulk of your supersonic trajectory.

2. True BC near transonic

Now shoot near the far end of your supersonic range, approaching transonic (roughly 1340 fps and below). If the solver is off here after MV is trued, adjust BC slightly to match. This shapes the tail of the curve where drag behavior gets touchy.

Do them in that order — velocity first, then BC — or you'll chase your tail adjusting two variables against one error.

Control the conditions you can

True on a calm day if possible, so wind doesn't contaminate your elevation reads. Enter real air density — temperature, pressure, altitude — because that's part of what you're truing against. Strelok can pull these from your device's barometer and GPS so your true is anchored to the actual atmosphere, not a default.

Re-confirm when things change

A true is a snapshot. Revisit it when you change ammo lots, swap the barrel, or move to a very different climate or elevation. Keep a short log of trued values per rifle and load — it's the highest-leverage page in your data book.

Save each load as its own profile in Strelok Pro, true it once, and your first-round solutions get dramatically more honest. The math was never the hard part — feeding it the truth is.