I shot a bunch of roos over the weekend with a 22lr. So long as I could get close enough to reliably hit them in the side of the head, neck, or upper chest, it put them down very well. A 17hmr with something like the 20gr gamepoint would definitely give better performance and be easier to get the precise hit with - making it a lot more forgiving.
But... Interesting though was that the 22 with subs and a suppressor was so quiet that the roos which weren't put down cleanly with the first shot didn't run off. They knew they were hurt. But they didn't seem to realise it was because there was a danger they should be trying to run away from. They just sat there wondering wtf was going on waiting for the 2nd bullet.
From shooting them with 223's (and bigger), I know that with that supersonic crack, they don't do this. They will run when hit (if not dropped instantly) and aren't going to stupidly hang around to give you a nice easy follow up.
So there were none that I hit with the 22lr that got away to die a slow death. I speculate there may have been some with a 17hmr though. Enough noise to make them run. Not enough damage to obliterate them like a centrefire.
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