Choosing a Zero Distance

Lesson 17 of 33 · Module 4, lesson 3

Assumes the Hunting Primer. New here? Start there first.

Your objective

By the end, you'll be able to choose an appropriate zero distance for a given Piedmont hunting cartridge and explain the trade-offs in trajectory at close and long range.

Judgment ~8 min

A deer steps out at the edge of a food plot — 175 yards. You’re zeroed at 100 yards. Do you hold the crosshair on the shoulder, or hold over? How far over? If you don’t know, you’re guessing. This lesson puts a number to it — and helps you choose the zero that reduces guessing in the first place.

Quick recall

From MOA & MRAD Basics — what does your zero distance actually represent in terms of the bullet's path?

The distance at which the bullet leaves the barrel at its highest velocity The distance at which the bullet's arc crosses the line of sight (where bullet path and sight line meet) The maximum distance you can shoot accurately

Show answer

Not quite: The distance at which the bullet leaves the barrel at its highest velocity — That is muzzle velocity — a ballistic property of the cartridge, not a zero setting. Zero is about where the bullet's path intersects your line of sight.
Correct: The distance at which the bullet's arc crosses the line of sight (where bullet path and sight line meet) — Exactly. The bullet leaves the barrel slightly below the line of sight (because the bore is below the scope), rises through line of sight at some close distance, then crosses it again at the zero distance. Past the zero, it falls below the line of sight.
Not quite: The maximum distance you can shoot accurately — Zero distance is not a maximum range. Past your zero the bullet keeps traveling — it just falls below point of aim. You can still hit targets past zero, but you need to hold over or know the drop.

How a bullet’s arc relates to your line of sight

A rifle’s bore is below the scope. The bullet exits the muzzle pointing very slightly upward relative to the line of sight, rises to cross the line of sight at some close distance (often 25–30 yards), continues rising to a peak, then falls. It crosses the line of sight a second time at the zero distance — and after that, falls progressively below where you are aiming.

This arc means a zeroed rifle fires slightly high at intermediate distances (between the two crossings) and progressively low past the zero. Choosing where that second crossing happens is choosing your zero.

The why Why the bullet crosses the line of sight twice

The scope is mounted roughly 1.5 inches above the bore center. If you bore-sighted at infinity, the shot would always land 1.5 inches low. Instead, the bore is angled very slightly upward relative to the scope so the bullet rises to meet the line of sight at a near distance, continues above it briefly, then falls back through it at the zero distance. You can think of the line of sight as a straight ruler and the bullet’s path as a very flat arch that just barely clears the ruler top, touches it at the zero distance, then drops below. The height of that arch above the ruler is your maximum mid-range rise, which matters when you are shooting at close targets and need to know if the bullet is striking high.

The 100-yard zero — the practical standard

A 100-yard zero is the most common choice for US hunters for straightforward reasons:

Easy to verify. Nearly every range has a 100-yard line. If your zero shifts (after a bump, after shipping), you can re-confirm anywhere.
Simple math. The MOA calculations from the previous lesson all use 100-yard groups. Your hold at 100 is exactly what it says.
Conservative for Piedmont. Most Piedmont deer hunting happens in timber or thick brush where shots inside 100 yards are the rule. A 100-yard zero means you are always dead-on at 100 and close at 50 (slightly high, usually 1–2 inches depending on cartridge).

The cost: at 200 yards, most common deer cartridges (.30-06, .308, .243, .30-30, etc.) land 3–6 inches below point of aim with a 100-yard zero. At 200 yards, a 4-inch drop means holding the crosshair on the top of the deer’s shoulder to put the bullet in the vitals. Know your specific number before you need it.

Deep dive Drop figures for common Piedmont cartridges at 200 yards (100-yd zero)

These are approximate — actual drop depends on your specific load, bullet weight, and muzzle velocity. Run your exact load in a ballistic calculator (Hornady, Federal, or a free online tool) and verify on paper at the range.

.30-06 (150 gr, ~2,900 fps): roughly 3–4 inches low at 200 yards
.308 Win (168 gr, ~2,650 fps): roughly 4–5 inches low at 200 yards
.243 Win (100 gr, ~2,960 fps): roughly 3 inches low at 200 yards
.30-30 Win (150 gr, ~2,390 fps): roughly 7–9 inches low at 200 yards (flatter-arc cartridges are a bigger deal with the .30-30)
Muzzleloader 250 gr sabot @ 2,100 fps: roughly 10–14 inches low at 200 yards

The .30-30 and muzzleloader entries are a reminder: not all cartridges are equal. Know your specific number.

The 200-yard zero and maximum point blank range

A 200-yard zero is a common step up for hunters who regularly shoot to 200+ yards in open terrain (fields, food plots, clear-cuts). With a 200-yard zero:

The bullet is slightly high at 100 yards (typically 1.5–3 inches, depending on cartridge)
Dead-on at 200 yards
A few inches low at 250–275 yards

Maximum point blank range (MPBR) takes this idea further: you choose a zero that keeps the bullet inside the deer’s vital zone (roughly a 6-inch circle) from the muzzle all the way out to the farthest practical distance — with no holdover correction needed. For a flat-shooting cartridge like the .243 Win or .270 Win, this can push to 250–300 yards with the right zero. You simply hold center-of-vitals at any range inside that distance.

Piedmont context: why 100 yards usually wins

South Carolina’s Piedmont is wooded country. Much of the deer hunting happens from stands or blinds in timber, watching travel corridors and field edges at 50–150 yards. A 200-yard MPBR zero is optimized for open terrain where 250-yard shots are common — that is not most Piedmont hunting.

For most Piedmont hunters, the practical advice is:

Zero at 100 yards.
Know your drop at 150 yards (usually 1–3 inches) and at 200 yards (3–6 inches for common cartridges).
Know your maximum ethical range — the farthest distance at which you have confirmed you can keep three shots inside the vital zone from a field position.
Pass shots beyond that range.

(Verify current SCDNR regulations for legal equipment and any zone-specific restrictions before you hunt — see dnr.sc.gov. These change yearly.)

Schematic showing a horizontal line of sight from a rifle scope and the bullet's arc path. The bullet starts below the line of sight at the muzzle, rises to cross it near 25 yards, arcs slightly above, then crosses back at the 100-yard zero mark and continues falling. At 200 yards the bullet is noticeably below the line of sight. — Diagram (not a photo). The bullet's arc versus the straight line of sight — a 100-yard zero. The bullet is slightly above point of aim at mid-range and falls below past 100 yards. The critical information for a hunter: how far below at your likely shot distances.

The shot you didn’t expect

Decision

A buck steps out at the far edge of a clear-cut. Your rangefinder reads 210 yards. You are zeroed at 100 yards with a .30-06. You have never shot this rifle past 100 yards. What do you do?

Hold center-of-vitals and take the shot — it's only 110 yards past zero

At 210 yards with a 100-yd zero on a .30-06, the bullet is hitting roughly 5 inches below point of aim. You hold center-vitals and drive it into the brisket, low of the lungs. Possible recovery; possible wounded deer with a long, uncertain night.

Guess at a holdover — maybe 6 inches high — and take the shot

Your guess happens to be close (the actual drop is about 5 inches), but it's still a guess. You get lucky this time. This is not a system you can count on. Know your numbers before the moment of truth.

Pass the shot — you have not verified your trajectory at 200 yards

The ethical call. You do not have confirmed data for 210 yards. At the range before next season, you verify your 200-yard impact. You find it hits 5 inches low. You add that to your field knowledge. Next time you are ready.

Read the zero scenario

Knowledge check

A hunter's rifle is zeroed at 200 yards. At 100 yards, where will the bullet strike relative to the point of aim?

Slightly HIGH — 1 to 3 inches above point of aim for most common cartridges Dead on — zero means the bullet is always on the crosshair Slightly LOW — the bullet drops as soon as it leaves the muzzle

Show answer

Correct: Slightly HIGH — 1 to 3 inches above point of aim for most common cartridges — Correct. With a 200-yard zero, the bullet's arc rises above the line of sight between the muzzle and the zero point. At 100 yards it is still above the line of sight — typically 1.5–2.5 inches high for common deer cartridges. This means at 100 yards you need to hold slightly below where you want to hit, or account for the high impact.
Not quite: Dead on — zero means the bullet is always on the crosshair — Zero means dead-on at ONE distance (the zero distance). At all other distances the bullet is either above or below the line of sight, depending on where it is in its arc.
Not quite: Slightly LOW — the bullet drops as soon as it leaves the muzzle — Gravity pulls the bullet down immediately, but the barrel is angled slightly upward so the bullet rises to meet the line of sight before falling. At 100 yards with a 200-yard zero, the bullet is still in its upswing — it hits HIGH, not low.

Knowledge check

You hunt Piedmont timber where almost all shots are inside 120 yards. Which zero is most practical for your setup?

100-yard zero 200-yard MPBR zero optimized for wide open fields 300-yard zero to give maximum long-range capability

Show answer

Correct: 100-yard zero — Yes. Inside 120 yards with a 100-yard zero, bullet drop is minimal — typically less than 1–2 inches at 50 yards (slightly high) and dead-on at 100. It is the easiest to verify and most practical for close-range timber hunting.
Not quite: 200-yard MPBR zero optimized for wide open fields — An MPBR zero is optimized for terrain where 250-yard shots are common. In Piedmont timber at under 120 yards, that zero adds unnecessary complexity (the bullet is 2+ inches high at 100 yards) without meaningful benefit.
Not quite: 300-yard zero to give maximum long-range capability — A 300-yard zero means the bullet is rising significantly at 100 and 200 yards — often 6–10 inches above point of aim mid-range. In close timber that creates unpredictable impact at typical shooting distances. It is a bad match for under-150-yard hunting.

Take it to the woods

Know your trajectory before the season

0/5

Decide on your zero distance based on your typical Piedmont hunting range (100 yds for timber, 200 yds for open fields and food plots).
Look up or calculate your actual bullet drop at 150 and 200 yards for your specific load — use the manufacturer's ballistic data or a free online calculator.
Verify your zero at 100 yards before hunting season, firing a 3-shot group (not a single shot).
If you plan shots past 150 yards, verify your impact at that distance on paper from a field position, not just a bench.
Safety Set your maximum ethical range as the farthest distance at which you can reliably keep 3 of 3 shots in the vital zone from your hunting position. If you cannot hit a paper plate 3 for 3 at a given range from the field, that is not an ethical shot distance.

Sources

What is the best zero distance for hunting rifles: https://www.themeateater.com/hunt/firearm-hunting/whats-the-best-sight-in-distance-for-rifle-hunting
Maximum point blank range explained: https://www.ronspomeroutdoors.com/blog/understanding-mpbr-for-better-shooting
How to zero your rifle for maximum point blank range (NRA): https://www.americanhunter.org/content/how-to-zero-your-rifle-for-maximum-point-blank-range/
Rifle zero distance practical guide: https://www.outdoorlife.com/story/guns/whats-the-best-distance-to-zero-a-hunting-rifle/
SCDNR Hunting Information: https://www.dnr.sc.gov/hunting.html (verify current SCDNR regulations before you hunt — these change yearly)

If you remember nothing else

Your zero distance is the range at which the bullet's path crosses your line of sight — past that, the bullet falls below the line of sight.
A 100-yard zero is the most common hunting zero and the easiest to verify; it leaves 2–4 inches of drop at 200 yards for most deer cartridges.
A 200-yard zero keeps most cartridges within a few inches of point of aim from the muzzle out to 225–250 yards — a 'maximum point blank' approach for open country.
For Piedmont timber hunting with shots typically inside 150 yards, a 100-yard zero is usually the practical choice.
Know your actual trajectory at the ranges you will shoot — guessing costs animals.

How ready do you feel?

How ready are you to pick a zero distance for your hunting setup and explain what your bullet is doing at 50, 100, and 200 yards?

Before you go — a quick look back

Distributed practice: one fast recall from an earlier lesson keeps it from fading.

Quick recall

From MOA & MRAD Basics (Module 4, Lesson 2) — if your group lands 2 inches high at 100 yards and your scope uses 1/4 MOA clicks, how many clicks DOWN do you need?

Show me the answer

Show answer

Correct: Show me the answer — 8 clicks down. 2 inches ÷ 0.25 inches per click = 8 clicks. The click calculation is the tool that lets you move from a 'close' first zero to your chosen distance zero efficiently.

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