If it were me I would do the following in this order - and if you find "something" stop at that step, resolve the issue, and retest the rifle:
0) If by some chance you've not done so already, clean the rifle well including the bore. If there was grit in the bore, that could cause a temporary - or permanent - accuracy issue. If you think you shot it with grit in the bore I'd inspect it with a borescope - or have it inspected.
1) Check the crown of the barrel - use magnification - any damage there needs to be addressed...
2) Check the mounts for the scope is anything loose? Give it a gentle nudge - any shift? If so - fix that and retest...
3) If you have a different scope that you can swap in- do so and re-test. If not - then loosen and reset / retorque the scope rings... Retest
4) Remove the action and barrel from the stock... look for grit / dirt / material between the barrel and the stock. You said that the drops were out in the sticks while hunting - I've got no idea how tightly the stock aligns with the barrel - but if you got grit in between them and it is putting pressure on the barrel and shifting with recoil - I could see that causing a spread in the group.
5) If you did not have another scope to swap on, and none of the other things have resolved the issue, then I'd send the scope back.
Just my 2 cents.