stubblejumper....

after my father picked up some 150ge. nosler ballistic tips for his savage scout and getting decent groups at 100yds. ( 1&1/4" )
i was thinkign of going with the nosler ballistic tips. but since most shots are under 75yds since i have found some real nice spots a few revines overlooking swamps.
could this round deflect twice as bad when hitting a twig since it has a plastic like tip?
also how do they hold up for close up shots ( 50yds or less )? i have used the win ballistic tips in the past did the job but like you know i have heard and seen offhand what can happen with them.
also since they seem to " mushroon " up on contact is it worth going to them for shots under these conditions. what grain size should i go with? 165gr. 180gr.? sdince they do expand instantly.

i know my gun might not shoot as good but i will give them a try this weekend.