I have several 6.5 swedes and have taken several whitetails with them. No need for the Partition or the Grand Slam, whitetail are not that tough unless you want to take a Texas heart shot stern to bow.
How long distance do you plan on shooting?
The fast load 120G Scenar will do very nice (Lapua makes the load in 2 speeds as far as I can see), Accubond are good, the 156G Norma whitetail works well, I suspect for whitetail that the S&B 131G softpoint would be fine also. If nothing else the S&B provides good, inexpensive brass for reloading. I took a doe a couple years ago with the Lapua 156G Mega and she dropped and never moved, most impressive DRT I have ever seen. Lastly, dunno if you can find any but Sako had a load out for deer that shoots real well in a couple of my 6.5 rifles.
RAS
PS this is the Sako loading - I caught some on sale couple years back for a good bit less $:
https://www.impactguns.com/rifle-am...-box-082442949536-c663436hsa10x#ammoseek
