I use 2206H in my 7x57 with 140's, slightly more than you loads, but not much. And for about the same velocity. Theres something pretty satisfying hitting an animal with a 7x57, they all seem to go tits up with just one shot! I think if you are happy with your results then 41gn is the go, maybe try 42. But looks pretty bloody good for a first attempt.
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