Sometimes it's easier to find something close to use as a substitute for the combination you're looking for. Barnes lists the 6.5-300 Weatherby which is almost exactly what the 26 Nosler is (one grain difference), especially if you start low and work your way up to the pressure level of your firearm. Note that this information is from a 24" barrel:
I have also used the Hammer Hunter in the 124 grain version which is excellent. I have their 137 on hand but time is working against me right now for testing.