I would just go with the .28 NOS and if I wanted to save barrel life just back down the horsepower a little.
I really had high hopes when I saw they were working on a 7PRC, I was just expecting it to be a necked down 300 PRC because of the weight availability the 7mms have over the 6.5s. I dont know of anything over 156gr for the 6.5 but the 7mm has 185s, 190s, 195s, 197s, so I was just expecting a big magnum capable of RUM territory performance.
For now I will stick with my 7RM, it gets me to 2900 on the 195s and does groups 1/2 MOA so Im happy