Welcome to both you guys. The 7mm-08 is not a lot unlike the 7x57. I used to shoot 154 gr bullets in my 7x57's because they shot so well. But I think if I could have got the 139/140 gr bullets to shoot better, I'd have used them more.
I'd stick with whatever you are shooting now. The 7mm - 08 is plenty of rifle for antelope with any hunting bullet. Accuracy and knowing the rifle and how it shoots are far more important than anything.
Federal Premium 140 grain with Nosler Balistic Tips or Winchester Supreme with 140 grain Balistic Silvertips. Either one of these should be very accurate, give you great long range performance, and be just the right type of bullet to take down your 'lope. Have a great hunt!
As the allure of hunting big whitetails becomes more and more a passion for many, we are finding that the recent (historically speaking) popularity of hunting deer from a tree stand is becoming the way to do it. I'll make no statement either for or against that technique here. This will be simply an essay on what I feel are some outstanding rifles for tree stand use.
Before we go even one more step, let's all remember that safety is first and foremost for anyone wanting to hunt...