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Maximum Point-Blank Range (MPBR), Explained

MPBR is a hunting zero that lets you aim dead-center and hit the vitals across a wide band of distances — no ranging, no holdover, no dialing. Here's how it works and how to set it up.

The idea

Because your scope sits above the bore, a bullet starts below your line of sight, rises through it, arcs over, and falls back down. If you angle the barrel so the bullet never rises or falls more than half of your target's vital zone, then anywhere inside that band you can hold dead-center and still hit. The farthest edge of that band is your Maximum Point-Blank Range.

Three things set your MPBR

• Vital-zone size — the circle you must stay inside. Deer vitals ≈ 8 inches; a smaller target means a shorter MPBR.
• Bullet performance — muzzle velocity and ballistic coefficient. Faster, sleeker bullets shoot flatter and stretch MPBR.
• Zero distance — the sight setting that produces the ideal arc for your vital zone.

Worked example

A 6.5 Creedmoor 140-grain load at 2,710 fps, with an 8-inch vital zone, works out to about a 264-yard zero (roughly 3.4 inches high at 100 yards) and an MPBR near 310 yards. Inside that, you hold dead-center. Past it, you range and dial.

How to set it up

1. Open the AHL Sight Zero tab and pick your cartridge (or enter velocity, BC, weight, and sight height).
2. Choose your target/vital zone size.
3. Read the recommended zero, how high to sight in at 100 yards, and your MPBR.
4. Zero the rifle at that distance and confirm on paper.

When MPBR is — and isn't — the right tool

MPBR shines for hunting inside a few hundred yards where the target is generous and speed matters. Past your MPBR, or for precision on small targets, switch to a 100-yard zero and dial or hold using a full DOPE card. AHL Sight gives you both.

AHL Sight is a planning aid. Always confirm your zero with live fire and follow all firearm safety rules.