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| L -> R: .270 Winchester, 6.8x43mm SPC, 7.62x51mm NATO |
.270 Win and 6.8 SPC are half of the rifle rounds offered commercially in .277 caliber. There's also .270 Weatherby Magnum and .270 Winchester Short Magnum (WSM). .270 Win and 6.8 are also as similar as .30-06 and .300 Blackout.