7mm Mauser is faster at the top of its range (2,900 vs 2,850 fps); .275 Rigby carries more energy at its hottest load (3,159 vs 2,800 ft·lb). Both figures are range maxima; typical loads run lower.
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At the top of the range, 7mm Mauser is faster — 2,900 fps versus 2,850. Real velocity depends on the specific load and barrel length, so check individual factory loads before you decide.
Which hits harder, .275 Rigby or 7mm Mauser?
.275 Rigby carries more muzzle energy at its top load (3,159 vs 2,800 ft·lb). Energy alone doesn't decide terminal effect, though — bullet construction and placement matter more.
Lindcott Armory