RUGER® M77® MARK II rifles are chambered for many of the most popular factory-loaded cartridges manufactured in accordance with U.S. industry practice. The particular caliber for each rifle is rollmarked on the barrel. Use cartridges only of the designated caliber that is marked on the barrel. Please see "Warning - Ammunition" and "Warning - Loading" on page 14.
Ruger M77 Mark II Express bolt action rifles are chambered for either the .270, .300 Magnum, 7mm, .338 Magnum, or .30/06 cartridges in all factory loadings. The Ruger Express Rifle magazine capacity is three cartridges.
Ruger M77 Mark II Magnum bolt action rifles are chambered for either the .416 Rigby, .404 Jeffery, .375 H&H Magnum, or .458 Lott cartridges in all factory loadings. The Ruger Magnum Rifle magazine capacity is three cartridges in .416 Rigby, three cartridges in .404 Jeffery, four cartridges in .375 H&H, and four cartridges in .458 Lott.
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