Love the caliber with 140gr Accubonds-factory and reloads. I have two in the Tikka T3 LS and this past December added a Sako m75ss into my Sako m75 collection.
Taken elk, moose, bears, deer at various distances-majority 1-shot kill (double lung-pass thru penetration).
Longest two shots I can recall was my wife's. She spent a lot of time at the range with me shooting. A 400m on her first mulie and her first bull moose the next season at 325m. She placed the proper crosshair for the distnce in the Boone & Crocket reticle in the Leupold scope and squeezed the trigger.
I have taken elk 200-300m no problem with this caliber. Took my last large cow elk a couple years ago...it was -33 and about 200m. Make the proper shot placement. I prefer double lung myself.
Buy the Finnlight and be happy for ever! I bought my first new rifle back in 1997 - Sako m75ss 300WM and never looked back from that day. Now I have "few" Sako m75 rifles
Enjoy your new rifle and your planned hunt.