.270 Winchester

Uncommon card · No. 90987

The .270 Winchester is a rifle cartridge developed by Winchester Repeating Arms Company in 1923, and it was unveiled in 1925 as a chambering for their bolt-action Model 54 to become arguably the flattest shooting cartridge of its day, only competing with the .300 Holland & Holland Magnum, also introduced in the same year. The .270 Winchester case is a necked down .30-03 Springfield, retaining the slightly longer neck of that original parent cartridge. (Note the actual SAAMI and CIP length specifications of the .270 Winchester vs. the .30-06 Springfield and that of their parent cartridge the .30-03 Springfield, with a C.I.P. length of 64.52mm, and a SAAMI of 2.540 inches. Winchester had chambered the Model 1895 Lever Action Rifle in .30-03 Springfield in 1905, then the slightly shorter .30-06 Springfield in 1908.) The .270 Winchester uses a .270 inch (6.86 mm) bore diameter and a .277 inch (7.04 mm) bullet diameter. The bore diameter was likely inspired by 7mm Mauser. The physics of lead...

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