Why five-round groups beat three for spotting shooter error, not rifle error

If your zero session keeps drifting group after group, the problem might not be your rifle. In a video from Tactical Rifleman, the instructor breaks down a student's target to show how three-round groups can quietly sabotage a zero.

Snapshot

Tactical Rifleman looks at a 25-meter target where three shots formed a clean triangle, and explains the rifle is actually capable of a dime-sized group at that distance. His point: the spread wasn't the weapon, it was the shooter pulling rounds without realizing it, and three shots simply aren't enough to sort good hits from bad ones.

Key points

• The military standard isn't foolproof: shooting three rounds, checking, then repeating is common practice, but the instructor argues it can hide shooter error instead of revealing it.
• The rifle can outperform the group: at 25 meters the weapon system demonstrated it could print a dime-sized group, meaning the wider triangle was shooter-driven, not mechanical.
• Pulled shots are hard to identify: with only three rounds on paper, there's no reliable way to tell which shots were true and which were pulled, and the shooter often can't say either.
• Guessing the center creates bad data: treating the triangle's middle as the true group center, when one or two shots were actually pulled, leads to unnecessary sight adjustments.
• More rounds means a clearer picture: the video's underlying argument is that five-round groups give enough data to separate real point of impact from a handful of errant shots.

Quick take

This is a simple fix for a common frustration: if your zero seems to wander every range trip, stop chasing three-shot groups. Tactical Rifleman makes a solid case that five rounds gives you the sample size to trust your adjustments instead of chasing your own flinch.

Watch the full video: Tactical Rifleman