>Has anyone had any experience with either of these cartridges?
So to say, yes.

My wife shoots the 6.5x65R in a Blaser K95. She uses the 8 Gramm RWS KS laboration. We shot eight does (German Rehwild, up to 20 kilo weight) with it, all stone dead on impact. She also got two wild pigs at about 40 kilos each, both fell at once. An about 80 kilo boar was shot right onto the shoulder, and we never saw him again. Found nearly nothing (hair/bone/...) on the site.

The 6.5x68 seems to produce large hematomes on the game body, while the 6.5x65R with the KS bullet doesn't.

If I remember correctly, the -68 is not available with a rim (flanged?) - at least I never heard of one or saw one.

Joachim