I think the tipped Barnes expand more reliably. Perhaps the tips help initiate expansion better.
I have not had trouble with "soft" bullets killing, ie lack of penetration(other than obvious varmint bullets used by mistake) but rather from too hard bullets.
Out of interest the worst experience I had on a deer was three wounding shots and a long messy tracking job - was also with a .257 Roberts as it happens, using moderate loads from the traditional old 257 Rob data which was underloaded anyway. Slow hard bullets acting like FMJ and a rattled shooter after things started going bad.
It does concentrate the mind wonderfully when tracking spots of blood at shoulder level on bushes with limited visibility and a cocked rifle.
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