.257 | 100gr | Speer Boat-Tail

About this bullet

.257 | 100gr | Speer Boat-Tail is a bullet made by Speer. At 100 gr (6.5 g) and a diameter of 0.257'' (6.53 mm) it suits handloads where bullet weight and barrel length have to be matched carefully. Its G1 ballistic coefficient of 0.393 drives velocity retention and wind drift downrange — higher values mean a flatter trajectory at distance. A twist rate of 1:11.5 is recommended for stable flight; slower twists can under-stabilise this bullet. We currently list 517 load recipes across 15 calibers for this bullet.

Most popular calibers for this bullet

Load data for .257 | 100gr | Speer Boat-Tail bullet is available in the following calibers:

• .25 Creedmoor
• .25 GT
• .25 WSSM
• .25 WYB RPM
• .25 x 47 Lapua
• .25-06 Ackley Improved
• .25-06 Rem.
• .25-35 Win.
• .250 Savage
• .255 GS
• .256 Mag. Gibbs
• .257 Ackley Improved
• .257 Roberts
• .257 Weath. Mag.
• 6.5 x 52 R

Safety notes

All load data is reference data only. Always start at the minimum charge and work up in small steps while watching for pressure signs. Never exceed the maximum charge published by the powder or bullet manufacturer.