Many hunters don't realize the Speer boattails are NOT Hot-Cors. Instead they're swaged around a cold core, and the cores are pretty soft.
Sierra GameKings work fine as long as they're not started much faster than 2800 fps, but of course many handloaders try to push any bullet as fast as they can--and with the 150 .270 GK that can easily be 3000+ fps with Reloder 26.
As others have noted, the slightly higher BC of softpoint boattails doesn't mean squat at ranges out to 400. If you want a noticeably higher BC, for whatever reason, try one of the newer .270 bullets like the 140 Berger Classic Hunter, 145 Hornady ELD-X or Nosler 150 AccuBond Long Range. If you want a 150-grain softpoint spitzer that's reliable both near and far, even at 3000+ fps, the Hornady Interlock Spire Point is hard to beat.
