RE: Opinion on the 223 as a deer hunting cal ?
To answer the original question, I firmly believe that a 223 or 22-250 is ethical and effective on deer up to 200 lbs, BUT I also believe that bullet selection is more critical than with larger calibers. I started both my sons with a NEF 223, and we never had a deer take more than a step or two after being hit.
DD
If you want a 223, buy another barrel for your Blaser.