I'm of the opp view because I love trying things out in diff calibres, different rifles, different projectiles. If you stick to one or two rifles it makes sense to just hold supplies for the load that works well in each. If you're a glutton for punishment like me, the world is your oyster, go fill yer boots. If you stock a powder and later find no use for it there is likely to be some GC around who will be pleased to take it off your hands. So it all depends on what floats your boat.
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