There's a saying in Sweden, always use a 6.5 for moose, that way they'll run all the way out to the road...or something like that. Lol.
I had a client out for his first red stag. Missed the first, poor shot with 2nd, missed the 3rd...arguably piss poor shooting despite being fine on paper targets...but now you have a travelling beast and no more rounds in the mag...
Imho-3 round mags just ain't enough, no matter how good you are, and especially true for DG or if you plan to take multiple beasts in a group/herd.
I have 4 family members shooting Tikkas in 6.5, they love them, I just roll my eyes every time they have to go and search for an animal...same poi, etc, just doesn't seem to happen with 7mm and 30cal, and on small deer species the 222, 223 and 243 are distinctly more efficient on terminal performance.
See the thing is, I still take the 6.5 out hunting, and yep, still get 2-3 times more dead running game, different species, different ammo, etc, all H/L shots of course,,but the trend, to me, is undeniable.
My 2 cents, get a 7x57 or 30-06, much better range if bullet weights and better performance on game.
Sure, 6.5 kills, but similar cartridges kill better, and that to me makes it an easy choice.
Tikka quality and accuracy as well as triggers, yep, undeniably good