All factory 270 Winammo is loaded for "modern actions". The term "modern actions" orreceivers refers to anything made to Mauser 98 standards. The 98 was designed in the 1890's. The 270 Winwas desgined in the 1920's, for the Winchester Model 54 which was basically a copy of the Mauser 98. So, since the 270 came about after the 98,pretty much all factory ammo is loaded as hot as you're gonna get. But like Chantecler said, if anyone loads hotter, it'sHornady.