Most of the heavier bullets are designed for target shooting and will not perform after impact.I whittled my deer caliber down to 243 many years ago, but lately have had some thoughts about 223 with the heavier bullets in a fast twist barrel. Just thoughts right now. The 243 does a good job; not sure I want to tempt fate and possibly lose one. I'll have to do more research before the thoughts get serious. I know people take deer all the time with 223, but I'll have to do the research before I get comfortable with it.
Must be .22 cal or larger and centerfire. The .204 Ruger is not legal.