Shower thoughts have turned to the same idea - necking up 17wsm to 20 or 22. A 20wsm seemed like a good idea - the 40gr .20 projectile at 2800fps would be worth a look. plus you could use it in a semi. And dreaming up something new is always stimulating.
But then the mental conversation ends up going round in a circle, and the good old .223 seems to win every arguement. I think last time i went down this mental minefield i convinced myself i should build a .20 vartag or 20 practical. And then I wake up and remember i already have a .223, and the .plain old .22lr still works perfectly fine for knocking possums out of trees, quietly and cheaply.
Its a great campfire discussion thou.
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