Now thats a good question to get some varied opinions.
My son shoots one and i will tell you it will kill a deer quick!and very well! But i also have 6mm rem which is the same bullet just uses a 7 x57 case. i lost a good buck cause the bullet exploded when it made contact with brush between him and me. it bloodied him but not bad. a guy killed him two days later a nine point w/ a 17.5 " spread. he had a nice wound on his left side that never penetrated his rib cage. the copper jacket apperently hit him with no lead in it.
But i will assure you a large caliber can and will be deflected by brush also. but i when hunting brush i use a 308 win.
and if i my 300 win mag wasnt a sendero but was a regular 700 bdl i would use it in the brush.
Oh yeah i saw one saturday that a guy gut shot with a 243 and the thing ran a total of 50 yards. i have shot them with 30-06 's and had them run farther than that.
My boys taken two with his so far (saturday is coming) and i have been very impressed with it. he will shoot more deer this year than most will . he has a buck so far this year and i will bet he gets another saturday. by the time the year is over i will bet he kills four with it. now when that occurs i will form an opinion based on history rather than just personal opinion because i don't like the round!
Oh yeah he shoots a 70 gr ballistic tip. and i will take him to the range and put him against 95% of the adult hunters with their rifles any day . and bet he out shoots them!and shot placement is everything period!

SOUTH ARKANSAS REBEL