you want a really good grouse/hare head. a 357 case with a large HTM blunt (I think the are called barta blunts now).
For hares you dont need that case. For grouse you most certainly do!
If you try them, you'll want to remove the extractor rims. Pretty simple on a belt sander....even with a file it goes quick. Slide the blunt on and your done.
The other plus in snow, a huge hole for 'arrow trackn'. Shove an arrow in the previous shot hole and keep working it down till it buts up to the nock. Think of the blunt like a wadcutter in snow
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Next time you're up this way holler Tim! I Havent bothered with bunnies in awhile, keep kicking it around...usually too busy looking for the cats when I find the hares.