Both calibers will make it to 1500 yards. When deciding on a cartridge for long range shooting, you will need to define what exactly your yardage will be and what the bullet will need to do once it gets down range. I plugged both calibers into a ballistic calculator on my phone.
The 300 win mag 190gr SMK at 2950fps performance: 1000 yard will need 28.11MOA and have 885ft-lbs of energy
1500 yards will need 61.96MOA and have 462ft-lbs of energy
crosswind: 1000 yards: 6.21MOA
crosswind: 1500 yards: 12.26MOA
6.5 creedmor 140gr eld-match at 2780 performance: 1000 yards will need 28.79MOA and have 741ft-lbs of energy
1500 yards will need 59.14MOA and have 408ft-lbs of energy
crosswind: 1000 yards: 5.15MOA
crosswind: 1500 yards: 10.01MOA
Both loads could probably be juiced up for more FPS but you get the picture. The smaller 6.5 will have roughly the same drop, and have the same kenetic energy, and have roughly the same wind deflection characteristics. I am aware that there are better bullets now for the 300 win mag, and you could use the 143gr eld match for the 6.5 creedmor or really juice the loads. But the results will be the same. The 6.5 creedmoor will get the job done using less powder, less barrel ware, and far less abuse on your shoulder. If you buy your own ammunition and live in a state where you can order ammo, then you can get 6.5 creedmoor for a little more than a dollar a shot: https://www.budsgunshop.com/catalog/...oducts_id/1042
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