My one uncle used a 256 magnum on deer for years
Always 1 shot 1 kill
I would not recommend it but he did it (always close range)
I legally slaughtered 22 deer last year with my Bravo AR .223 and 55 gr. bonded softpoint bullets. Most were running, double lung shots and all were one shot kills. (FYI this was because of new chronic wasting regs. that required a lot of money for testing and put a local deer farm out of business. Meat was donated to food banks.)
