I have a long action 700 what to do with it

338-280AI. Just to be different... 280 AI brass is available, it's a simple neckup to 338 and it's a critical 1/10th of an inch longer than a 06 case..

You already have the samller bore's covered, so a 338 makes the most sense.
 
If you want to do a bit if quirky do an 8mm Gibbs or a 338 Hawk. Both are '06 case based and both will get 2800fps or better out of a 200gr bullet. Tons of smack down for that platform.
 
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