What caliber rifle should i buy for long range shooting?

I am wanting to purchase a rifle for hunting in west texas. I would like to purchase a rifle caliber that will be accurate at long range. I'm thinking 500 yrds will push my skill level. I've narrowed my options to three calibers that interest me. (270) or (7mm Rem Mag) or (300 Rem ultra Mag)? I need a... show more I am wanting to purchase a rifle for hunting in west texas. I would like to purchase a rifle caliber that will be accurate at long range. I'm thinking 500 yrds will push my skill level. I've narrowed my options to three calibers that interest me. (270) or (7mm Rem Mag) or (300 Rem ultra Mag)? I need a little input and advise on making a good choice for my purchase. Which one of these calibers perform the best?
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