Fiftydriver
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Here are som pics form when I tested 300 grs Bergers at 2200 yards at sea level.
MV was 2736 fps out of my 338LM. It was a very mild load, but it held tight groups at 1000 yards.
The 5 shot group measures 40 inches, including the coldbore shot.
The bullet has no problems going through the transonic range and into subsonic speed. It was a bit windy, and I struggled with the terrain where I was shooting from, it was a wet spot, and I sunk deeper down into it for every shot I made.
Will try again when my new barrel in 338LM Imp is ready.
From the numbers I get running your information, it looks like your combo would be supersonic to very close to 2200 yards depending on bar pressure and humidity at sea level so I would not say that your load has completely passed through the transonic velocity ranges.. Looks like your just started to get into them. Set a target up at 2500 yards and then you would certainly see the bullet passing through the transonic velocity ranges and also be able to see how she flies on the back side of them.
2 moa at 2200 yards in the wind is pretty good performance for sure. Good shooting.