.270 Winchester
rifle cartridge
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 projectiles determines that .277in. bullets of a similar material and weight to the .308in. bullet (commonly used in the .30-06 Springfield) will obviously have to be longer than that similar weight .308in. lead projectile.
The public source identifies “.270 Winchester” as rifle cartridge. This brief keeps that definition visible, then builds a research path around Winchester, rifle and cartridge.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q2611572. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1923, 1925, 1895 and 1905.
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This entry incorporates text from “.270 Winchester” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.