Since Fabs brought my name up I will add my 2cents
......We have made clean one shot kills on deer at 500 yards with a 270win.Shooting the 140gr BT...That is as far I will will take it tho.It does not drop below 1000ftlbs on energy until about 650 yards.I like to stay as close to that as I can .As for being the perfect cart for all situations,no it is'nt...But for the inside 500 yard guys its real close..Shot placement to me is job one.And yes there are people out there that can make one shot clean kills at 500 yards and beyond in any wind short of a hurricane.Just to add something here..My LR gun is a 300 Ultramag shooting a (Rocky will like this) 210gr Match style bullet with a b.c. of .665 at 3350fps has 2800ftlbs of energy at 650 yards and does'nt drop below 1000 til 1500 yards...My 270 is my go to gun when I'm out walking.And I know it will do the job I ask of it when the time comes