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Ok you have a bit of a conundrum here. on the one hand you don't reload currently. this means the .260 factory ammo is loaded at higher pressures and performance than most factory 6.5z55. If (on the other hand) you did reload you could get better performance from the 6.5×55. The question you need to ask is “am i going to reload”?
You will have to judge how hard it is to find 260 rem ammo vs how likely you are to get into handloading if performance is your key criteria.
I doubt you will be disappointed with either caliber.
