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I still dont think tweaking the load will make this a varmint rifle - it’ll just log nick more and more range time.

I bet if you get a new truflite cut to 6x45 the first components you try will...

Is it by any chance an ex 6mm PPC barrel with a 1:14” twist ?

It ought to be comparable to the 222.
Try shooting them alternately side by side in the same session and see if theyre really different.
I agree with you 6x45 is a in its heart a small animal...

I think that's pretty good for a restored classic sporter with modest powered scope.
If its averaging outside 1 MOA for 5 shots then probably it could be improved with more work.
I would look at...