Bullet Length Library
Overall bullet length is what a twist-rate stability calculation actually needs — weight alone will not tell you whether a barrel will spin a bullet fast enough. Filter by maker, diameter or name, then check gyroscopic stability against your twist.
Twist stability (Miller)
Pick a bullet in the table to check it.
Under 1.0 is unstable, 1.0–1.4 marginal, 1.4 and above comfortably stable. Standard atmosphere; cold, dense air lowers Sg.
Bullets (…)
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About these measurements
Lengths are published bullet dimensions collected from the length list maintained at JBM Ballistics, plus manufacturer figures. Production tolerances and lot changes move these numbers by a few thousandths, and plastic-tipped bullets vary most. Measure your own bullets with calipers before you rely on a marginal stability result.