Great shooting for first time out
IMO , the S&B loaded ammo is good but not outstanding.
You can certainly do better with handloads . Luckily the Lapua and Norma brand brass is GTG with drilled flash holes etc so case prep is minimal .
I neck size only and its amazing how many firings you can get from the Lapua brass
Don't skimp on dies . You should go bushing dies ( I use Redding )
Just be aware the early TRG-42 are 1-12" twist rate which is not ideal for the 300Gr SMK or 300Gr Scenars . They changed this to 1-10 about 6-7 years ago
Was easy developing good loads with the 250Gr Scenars and SMK . It took a bit more work for me for the Barnes 225Gr for hunting
One thing with the Sako bipod is you really need to load it , or else its floppy
Problem with loading it at the range bench is the ski feet will slide on just about everything . I often use an Atlas for bench shooting since the rubber feet grip well
Prone or in the field the Sako is awesome
Biggest problem with bench shooting the TRG is the barrel heats up so fast ...you are burning about 100gr of powder !
I always bring another gun to play with at the range to allow the TRG-42 to cool .
You really have to spend time adjusting the stock to your liking .
Makes a huge difference on how the recoil affects you. For example, for my body, it was much better with cheekpiece offset away from me .
Adjusting the pitch and angle of the butt plate made it easier to have the rifle "push you" rather than hit you every time you pull the trigger
Not sure if you every plan to carry the rifle in the field, but the best investment I made was a TAB Biathlon sling
Lastly spend lots of time behind the gun before you play with the trigger.
The TRG trigger has awesome amount of adjust-ability but its easy to get carried away