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true, i forgot you are in OZ. surely the increase in weight would be minimal, you could always add a few grams of weight to the butt to keep the balance the same if it was noticeable.

have you tried feeding a .17hmr round through your action? if it feeds alright you could just rebarrel it in .17.

Being based on the .22wmr case i would have though that the .17hmr would feed from a tube mag perfectly well, some modification of the feed lips might be required and could be tricky. i know i hate...