Thats some fine shooting there brother !!
I'm just starting to shoot at these ranges with my edge too. Have you primarily used the bench at these ranges or have you tried the bipod, prone, rear bag combo ? just interested to see if you find your groups are better one way or the other ? One thing I can see is that the 300 smks from my gun make a hell of a lot bigger marks on my gong than those 250's. You just gotta give them a go mate !
With each step in the bush, you are a step closer.