.284 | 138gr | TWENTY-NINE ERTP

About this bullet

.284 | 138gr | TWENTY-NINE ERTP is a bullet made by TWENTY-NINE. At 138 gr (8.9 g) and a diameter of 0.284'' (7.21 mm) it suits handloads where bullet weight and barrel length have to be matched carefully. Its G1 ballistic coefficient of 0.432 drives velocity retention and wind drift downrange — higher values mean a flatter trajectory at distance. A twist rate of 1:9.0 is recommended for stable flight; slower twists can under-stabilise this bullet. We currently list 328 load recipes across 30 calibers for this bullet.

Most popular calibers for this bullet

Load data for .284 | 138gr | TWENTY-NINE ERTP bullet is available in the following calibers:

• .28 Nosler
• .280 Ackley Improved
• .280 Rem.
• .280 Riml. N.E. Ross
• .284 Win.
• 7 mm Backcountry
• 7 mm Blaser Mag.
• 7 mm Exp. Rem.
• 7 mm KM Katzmaier
• 7 mm Mag. Fl. H&H
• 7 mm PRC
• 7 mm Rem. Mag.
• 7 mm Rem. SA Ultra Mag.
• 7 mm Rem. Ultra Mag.
• 7 mm SAW
• 7 mm STW
• 7 mm Weath. Mag.
• 7 mm WSM
• 7 mm-08 Rem.
• 7 x 50 R
• 7 x 57
• 7 x 57 R
• 7 x 61 S&H (Super)
• 7 x 64 Brenneke
• 7 x 65 R Brenneke
• 7 x 66 SE v. Hofe
• 7 x 72 R
• 7 x 75 R SE v. Hofe
• 7-6.5 PRCW
• 7.21 Firebird

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.