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Good question. Don't know. Depends on end use perhaps. Target, pure lead is ok. Hunting, something a bit tougher that isn't going to completely deform?
I'm not sure it's incredibly important how it senses bullets, but the fact is it does, with all the types I used. I will try with a .22 next time I'm out, but I'm sure I will have no problem.
And yes, the V2 I believe has an improved mounting system, though now that I have this one figured out it's worked well for me.