Sighting-In & Zeroing

Opening morning. A buck steps into the lane at 90 yards, broadside, and stops. You settle the crosshair behind the shoulder, press the trigger — and he bolts unhit, because the scope your buddy “bore-sighted in the parking lot” was throwing four inches left. A deer rifle is only as good as its zero, and a zero you didn’t confirm yourself is just a hope. This lesson turns that hope into a known.

Quick recall

Quick recall from the marksmanship primer — what does it mean for a rifle to be 'zeroed' at 100 yards?

Quick recall from the marksmanship primer — what does it mean for a rifle to be 'zeroed' at 100 yards?

At 100 yards, the bullet strikes where the crosshair is pointed (point of aim = point of impact) The bullet flies perfectly flat and never drops It's the farthest the rifle can shoot

Check answer

Get on paper first, then get precise

You don’t start a sight-in at 100 yards — a scope that’s badly off can miss a full-size target there and leave you guessing which way to chase it. Start close, where even a bad scope lands somewhere on the paper.

1. Bore-sight at 25 yards. With the action open and the rifle locked in a rest, look down the bore at the bull, then move the scope’s crosshair onto that same bull without moving the gun. (Muzzleloaders and lever guns that won’t let you see down the bore: skip to step 2 and just shoot.)
2. Fire a group at 25 yards and adjust until you’re hitting the bull. A rifle dead-on at 25 yards is usually only an inch or two off at 100 — close enough to be safely on paper.
3. Move to 100 yards and do the real work there.

The why Why a group, never a single shot

One shot tells you almost nothing — it could be a flinch, a gust, or a flier. Fire a three-shot group, then ignore the individual holes and find the center of the cluster. That center is where the rifle is actually shooting. You adjust to move the group’s center to the bull, not to chase one hole around. A tight group that’s off-center is a well-behaved rifle that just needs a dial; a scattered group means slow down — breathing, trigger, or rest is the problem, not the zero.

Pick the zero that fits SC Piedmont woods

Most shots a Piedmont deer hunter takes are inside 150 yards — often well inside, in pine and hardwood where lanes are short. For that, the simplest and most forgiving choice wins:

• Dead-on at 100 yards. Hold center, fire, and inside roughly 150 yards your bullet stays within an inch or two of point of aim — well within the paper-plate vital zone. Nothing to remember, nothing to calculate in the moment.

That’s the recommendation for this course. A flatter “shoot 3 inches high at 100” setup exists for open-country shooters, but it asks you to remember holdover and risks shooting over a close deer’s back — the deep-dive explains the trade.

Edge case The maximum point-blank range (MPBR) option

Maximum point-blank range means zeroing a touch high so the bullet’s whole arc stays inside an 8-inch vital circle (the heart-lung zone) without you holding over. A common recipe for many modern deer cartridges is to zero about 3 inches high at 100 yards, which keeps the bullet in that 8-inch window out to roughly a 250–300 yard MPBR (American Hunter, secondary source). The catch: a deer at 40 yards with a 3-inch-high zero can be shot over the back if you hold dead center. For the short lanes of the Piedmont, a flat 100-yard zero is simpler and safer; save MPBR for when you’re actually shooting open fields and clear-cuts at distance. Your true MPBR depends on your exact cartridge and load — run your numbers on a ballistic calculator, don’t assume.

Read the target: adjust to the group, not the hole

Point of aim (bull) Group center — this is where the rifle shoots Move it DOWN and LEFT to the bull

Scope turrets are marked in clicks, usually ¼ MOA — about ¼ inch of movement at 100 yards per click. So a group 2 inches high and 1 inch right needs roughly 8 clicks down and 4 clicks left. The turret arrows show which way is “up” and “right”; you’re moving the impact, so to bring a high group down, dial in the direction marked D / DOWN.

Deep dive What '¼ MOA per click' actually means

MOA (minute of angle) is an angular measure: 1 MOA spreads to about 1 inch at 100 yards, 2 inches at 200, and so on. A ¼-MOA click therefore moves impact about ¼ inch at 100 yards, ½ inch at 200. Check your scope — some are ½ MOA or metric (mrad) — and count clicks rather than eyeballing. After a big adjustment, fire a fresh group to confirm; don’t trust the math alone.

Watch a full sight-in, start to finish

Here’s the whole process run correctly on a new scoped deer rifle, the way it actually goes. Read it through before you do it yourself.

A from-scratch sight-in, narrated

New rifle, new scope, never fired. You're at the range with a solid front and rear rest, eyes and ears on, a clear downrange backstop. First move?

Bore-sight at 25 yards, then fire to confirm you're on paper Skip straight to 100 yards and start shooting

Check the procedure

Knowledge check

Your 3-shot group at 100 yards is tight but lands 1 inch LOW and 2 inches LEFT of the bull. What do you do?

Your 3-shot group at 100 yards is tight but lands 1 inch LOW and 2 inches LEFT of the bull. What do you do?

Dial the scope UP and RIGHT to move the group center onto the bull, then re-shoot to confirm Remember to aim high-right in the field to compensate Fire one more shot at the bull and adjust off that single hole

Check answer

Knowledge check

For typical SC Piedmont woods hunting (most shots under 150 yards), which zero is the simplest, most forgiving default?

For typical SC Piedmont woods hunting (most shots under 150 yards), which zero is the simplest, most forgiving default?

Dead-on at 100 yards 3 inches high at 100 yards Dead-on at 25 yards and leave it there

Check answer

Take it to the woods

A zero isn’t done until you’ve confirmed it the way you’ll actually shoot, and re-confirmed it close to opening day. Pull this up at the range and work it in order — it persists, so tick as you go.

Pre-season sight-in protocol

0/7

Reset

• ⚠ Safety Eyes and ears on, muzzle downrange, safe backstop confirmed, finger off trigger until on target. The four firearm rules apply at the bench exactly as in the stand.
• Started at 25 yards (bore-sight if possible) to get on paper before moving back.
• Shot 3-shot groups and adjusted to the group CENTER, not single holes.
• Let the barrel cool between groups so heat didn't walk my shots.
• Finished with a confirmed dead-on 100-yard zero (or my chosen zero), centered on the bull.
• Fired confirmation shots from my REAL field position (sitting, off sticks or a rail), not just the bench. The bench can lie. The field is where the shot has to land.
• Re-confirmed the zero COLD, within a week or two of opening day, after any travel or optic change.

Sources

Primary and manufacturer/organization guidance used for this lesson. Always verify every SC season, zone, and legal-weapon specific against current SCDNR regulations before you hunt.

• South Carolina hunting rules — primitive-weapon and firearm provisions (verify against current SCDNR regulations): https://www.eregulations.com/southcarolina/hunting/general-rules-regulations
• SCDNR Deer Hunting program and regulations (verify current seasons, zones, and legal methods): https://www.dnr.sc.gov/wildlife/deer/index.html
• American Hunter (NRA) — “How to Zero Your Rifle for Maximum Point-Blank Range” (secondary): https://www.americanhunter.org/content/how-to-zero-your-rifle-for-maximum-point-blank-range/
• American Hunter (NRA) — “Learn Your Maximum Point-Blank Range” (secondary): https://www.americanhunter.org/content/learn-your-maximum-point-blank-range/