I searched for the max OAL for a 6.8SPC, and it seems to be 2.315", factory loads may be less.
A quick look around the web seems to bring up load data for 90gr to 115gr.
Hodgdon Powder only lists load data for 90gr to 115gr.
http://data.hodgdon.com/cartridge_load.aspYou might be trying to shoe-horn in too much bullet, assuming you are looking for fast loads. Assuming the Nosler is a lot longer than a 115gr bullet, if seated properly it will reduce powder capacity, but you may want this if you are after slower or sub-sonic loads.