All else being equal in terms of BC and suitable bullet construction, I agree that a killing shot from one of the 3 cartridges in reference will, 99.9% of the time, be as good as a killing shot from any of them.
However, the 6.8 W and the 6.5 PRC have an equivalent fuel tank, both in terms of volume and geometry. The 7PRC has more volume and is a long action round. It will shoot a little flatter and, due to less time in flight, it will drop and be blown around a little less than the other 2 over a given distance.
I'm not sure how it got started as a direct comparison, but the 7PRC is in a different class of cartridge in a lot of ways. If the 7PRC was built in a 6.5 PRC or WSM or RCM or SAUM case, it'd be a different scenario.
This. The 7 PRC is a modernized 7 RM. If I owned a 7 RM (I own a 280AI) and was happy with it, I would not feel any need to "upgrade."
- If I was buying a new rifle in the 7RM/280AI/7PRC, I would buy a 7PRC.
- The 6.8 W is in the 270 Win class. I don't think the 6.8W is really an upgrade. I don't think many people want to shoot heavy 6.8 bullets.
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