![]() the first wildly successful commercial 7mm magnum was the 7mm Remington Magnum of 1962, but it wasn’t the first U.S. This original 7mm gave rise to the 30-06 and all subsequent cartridges based on it, but it also inspired a lot of other 7mm rounds. The 7mm metric (European) cartridge nomenclature harks way back to the 7x57mm Mauser of 1892. To set the stage for this cartridge description, you should know that it is but one of more than a dozen commercially loaded 7mm cartridges now on the market that fire. Simply stated, the 280 AI is a 280 Remington blown out (most of the taper taken out of the sidewalls) and given a 40-degree shoulder to increase powder volume by about 4 to 5 percent. More and more production rifles are being chambered for 280 AI every year.280 AI was standardized by Nosler in 2008 and, SAAMI approved, is now being sold as factory loaded ammunition.A 280 AI can safely fire 280 Remington ammunition, simultaneously fire-forming brass cases to reloadable 280 AI dimensions.280 Remington chambers can be easily converted to 280 AI.280 AI shoots 50 fps to 100 fps faster than the 280 Remington with the same bullets in the same standard-length actions.As sometimes happens in the world of rifle cartridges, the 280 AI (Ackley Improved) is becoming more popular than its parent, the excellent 280 Remington. ![]()
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