As @10-Ring said, Re26 can do some spectacular speeds if YOUR RIFLE likes it and shoots accurately AT A SAFE LOAD LEVEL.
There is no guarantee that your rifle will shoot it well - mine didn't. Out of my 20" barrel velocity topped out at 2760fps, but the primers were cratering badly.
I also started out with a 22" barrel with a 4" forward suppressor. Got it shortened to 20" which seriously improved the balance - lost 55-60 fps doing so. But be aware velocity loss as you shorten barrels is not linear. The lower the expansion ratio of the cartridge, the greater th loss will be on average, but also there will be a point at which velocity takes a big hit. Some reading will show that the Creedmoor will very likely take that bigger hit going from 20 to 18 inches.
Sooo in summary @H.M, buy the 308 if you must have an 18" barrel and ideally handload. If sticking to factory the Precision Hunter seems good if your rifle will shoot it. Either way, out on the tops use a range finder and more importantly before you do - practice, practice, practice! Nothing like spending time on a long distance range (Sparrowhawk) to show the complexities of hitting things properly at longer ranges
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