Make it fly true.
A tuned bow shoots tighter groups, forgives a slightly rough release, and - the whole point for a hunter - puts your broadheads exactly where your field points go. Tuning sounds like a dark art; it's really a series of small, logical checks. Here's the plain version.
First, get the basics right
Most "tuning problems" are really setup problems. Before you chase a tear, make sure your arrow spine actually matches your draw weight and length (check the arrow spine selector), your nock point is square, your rest is roughly centre-shot, and your nocks fit the string snugly. Get those right and tuning is a quick polish, not a battle.
Reading a paper tear
The classic test: shoot an arrow through a sheet of paper from a few feet away and read the hole it leaves. A clean, round hole means the arrow is flying straight. A tear shows which way the back of the arrow is kicking.
Fix the vertical tear (nock height) first, then the horizontal one. Make small moves, re-shoot, and stop the moment you get a clean hole.
The other tuning checks
Shoot an unfletched arrow next to fletched ones at close range. Fletching hides tuning errors; a bare shaft can't lie.
HowIf the bare shaft lands with the fletched group, you're close. If it drifts off, adjust nock point (vertical miss) or rest/spine (horizontal miss) a hair and re-shoot.
Tunes your rest's left-right (centre-shot) by shooting at one aiming point from several distances.
HowAim at a vertical line at 10, then 20, then 30+ yards. If the arrows track straight down the line, centre-shot is good. If they drift, move the rest a tiny amount and repeat.
The one that matters for hunting: your broadheads must hit the same place as your field points.
HowShoot both at 20 yards. If broadheads land apart, they're steering a slightly untuned arrow - nudge the rest toward the field-point group (or fix spine) until they stack together.
On a compound, cams that roll over out of sync throw nock travel off and no amount of rest tweaking will fix it.
HowChecking and correcting cam timing, and anything needing a bow press, is a job for a pro shop unless you own a press and know the drill. Cheap insurance for an expensive setup.
Tuning starts with the right arrow: size it with the arrow spine selector, confirm it hits hard enough with the arrow KE calculator, then practise the shot itself in the first-season guide.
⚠️ A conceptual guide, not a substitute for hands-on help. Exact adjustments depend on your bow, arrows and release, and getting them wrong wastes arrows - or worse. Make small changes, keep broadheads sharp-side-away, never dry-fire a bow, and take anything involving a press, cam timing or draw weight to a qualified archery technician.