You'd be trading down significantly both in quality and horsepower.
BTW---THERE ISN'T ANYMORE $6 A BOX 223 AMMO.(unless you get a good buy on steel cased junk)
Given a choice between a 243 and a 223 with possible use on deer in the future, stick with the 243. I've shot deer with both(lot's of deer)and would NEVER chose the 223 over the 243 for this use.
No man portable firearm will guarantee that a deer won't run after being hit. Too many variables.
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