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if you have a couple of boxes of both...you are a fortunate fella.
PERSONALLY if that was the case,the 140s would be my red/roar load and the 120s everything else.

either will kill stuff as dead as a dead thing as long as you do your part and put them into the right place....do not over think it.....
the 130grn NBT kills well in .270 the 125grn NBT kills well...