Any of the cup and core bullets will work but I think what MD said is good advice , break the shoulders. I have used the 270 on and off since the 70s and have found that if the shoulders arent broken the deer still do run a bit, not far as a rule maybe 20-30 m but once shoulders a wreaked they don't go far if at all if anywhere.
I have noticed over the years after I started using the 30 06 that the deer dropped better than with the 270 especaily when using the 180 gr bullet. The 270 is an excellent caliber and will serve its owners well for many years to come.
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