The 270 is a most impressive round using todays new "factory" loads. You might want to chek out the Hornady 140 grn load.
This load works great out to 400 yds...not that anyone needs to shoot that far to kill a "goat"
If you want more there are several "custom reloading/loading" houses that can cook you up about anything you want.
I shoot a 270 a bunch and have taken elk out to 300 yds with it with these new loads. A little ole antelope at 300+ is no match for a well placed 140grn or good 130grn bullet for that matter.
It all goes back to the same story....a well placed shot... You don't need tons of energy or light speed velocity just practice....practice.
"single shot shooters only shoot once"