Load data for 7.21 Firebird + 140gr Sierra HPBT GameKing
340 suitable loads across 56 powder(s) for cartridge 7.21 Firebird with 140gr Sierra HPBT GameKing bullet.
The most recommended powders for this combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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Load Specifications
ImperialMetric
Bullet:.284 | 140gr | HPBT GameKing
Cartridge:7.21 Firebird load data
Case Length (l3):2.800" | 71.1 mm
Cartridge Length (C.O.L.):•••
Seated Depth:0.613" | 15.6 mm
Case Capacity:121 gow | 7.84 cm³
Primer Size:Large Rifle Magnum (LRM)
Max. Pressure (C.I.P.)::66,717 psi | 4,600 bar
Barrel Length:26.0" | 660 mm
Min. Twist Rate:1:10.0
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