1546, you really need to start reloading for yourself.
That Tikka T3 you're shooting, will shoot groups tighter than that with cheap Walmart White Box Ammo with the 45 grain hollow points.
I'm not knocking you in the least here by the way. That is very expensive ammo and even then, it may not be the best match for your particular rifle.
For $1100, you can pick up a very decent reloading set up, 1000 rounds of brass/bullets/primers and powder and tune the lot to suit your rifle.
Something to consider, as the leade wears in your rifle, you should be slightly increasing the OAL of your cartridges by not seating the bullets as deep. This may not seem like a big deal at first but it will soon get to be after 500 or so rounds, maybe even less.
If you are "time challenged" or "space challenged", there isn't much else you can do and I fully understand but in my experience, each rifle is an entity unto itself. Black Hills is trying to load their ammo to suit a lot of different platforms, all in one package. From your pics, they did a great job. IMHO, I believe that you could do better.
There is another factor at play here. That vertical group could have been caused by several different factors, other than the ammo or wind.
At 50 yards, if you don't have adjustable paralax on your scope, it will definitely be a factor as far as groupings go. Most fixed objective scopes are paralax free between 150 and 200 yards. It's very hard to shoot consistently at 50 yds with a long range set up.
Personally, I think you shot very well and the combination you're shooting if just fine for factory loaded ammo.
IMHO, you really need to start reloading to wring the potential out of that rifle. I have two T3s, one in 6.5x55 and one in 25-06. Both of them will consistently shoot under 1/2 moa with selected hand loads. Both will shoot factory produced match loads into slightly less than 1 moa consistently. Funny thing though both like the Hornady offerings and will shoot them in less than 3/4 moa.
It looks like you're doing your part though and when you settle down to consistent positioning behind the trigger, the rifle performs.