Performance
The .257 Weatherby is known for its long range performance and is considered an accurate flat shooting cartridge. Initially due to the cartridge’s high velocity the cartridge exhibits less bullet drop than most other cartridges. However, due to lower ballistic coefficients of these bullets, velocity (and therefore energy) is shed more quickly.
Weatherby’s B25780TTSX, B257100TSX and the N257115BST ammunition have point blank rages of 369 yd (337 m), 350 yd (320 m) and 323 yd (295 m) respectively. Thus no hold over is necessary when shooting at game at these ranges given that the rifles is zeroed correctly to accomplish this task.
The .257 Weatherby offers a 300–400 ft/s (91–120 m/s) over the 25-06 Remington cartridge which translates to around 600 ft·lbf (810 J) greater energy than the latter cartridge. Comparing the Remington's Premium PRC2506RA ammunition for the 25-06 Remington Weatherby's N257115BST .257 Weatherby bullet when zeroed for 200 yd (180 m) drops less than 30 in (76 cm) while the 25-06 Remington drop slightly over 44 in (110 cm) at 500 yd (460 m).
When sighted in for 300 yd (270 m) the bullet of Weatherby’s N257115BST ammunition has only dropped 21.9 in (56 cm) at 500 yd (460 m) and retains 1,347 ft·lbf (1,826 J) energy. Compared to the Winchester’s .270 WSM SXP270S ammunition show a bullet drop of 24.5 in (62 cm) but retains 1,552 ft·lbf (2,104 J). The N257115BST bullet retains enough energy to be effective on deer out to 550 yd (500 m) while the SXP270S's bullet extends this range out by a further 100 yd (91 m) although both the Weatherby’s and Winchester’s ammunition start with roughly the same muzzle energy.
Weatherby guarantees a 1.5 MOA accuracy with their ammunition in a Weatherby rifle, .99 MOA or better with their Sub-MOA Vanguard rifles, and .99 MOA or better with the new Vanguard Series 2 Rifles.
Read more about this topic: .257 Weatherby Magnum
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