It really depends on what kind of competitive long range shooting you want to do
Most NRA ranges shoot tr, ftr and f open. 300-1000 yards , although some ranges don't go out to the full 1000
Tr is open sights with a sling using .223 or .308 only, no rest or bag
Ftr is .223 or .308 using a bipod and rear sandbag
F open is any calibre 8mm or under, shot from a bipod or front rest and rear bag
I shoot f open and use a 6mmBr or a 6.5-284 with a NF 12-42 bench rest scope
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