Hmmm ......
I have no idee if yur a reloader, no mention of that 'sport' .......
Don't want glass on the rifle.
Want a fugly limey-style stock .......
All three rounds excell with a glass sight and lots of velocity .......
Open sights imply looser groups and closer ranges .......
.30/06 hands down! Open sights will give you minute-of-deer accuracy out to 200 yrads or more (if your eyes are that good).
.30/06, .30-30, and .270W are the three most popular big game cartridges in Norte Americano .......
.30/06 is the most versatile .......
.30/06 all the way!
I've killed over 20 BG with the .270W (elk, mulies, and pronghorns), so i know that round is no wimp.
The .280 is a big sister to the .270 and a reloader's dream, but that's the key to its success ...... rolling your own for it!
Of the three choices, the .30/06 is the "ford, chevy, mom, apple-pie choice of the rounds listed!"