Gentlemen,
Speer does make a 180 grain flat point, and Hornady may still make a 180 spitzer for pistol shooters. I have no expirence with either, as the 200 grain Hornady over a max charge of 3031 will shoot out to 300 yards with not much trouble. This is also the most accurate in my 700 classic, printing one group well under half an inch at 100 yards. 4320 works as good, better in the 225 nosler, actually.
I shot a real nice, thick eight pointer in 2000 the Hornady load, in the 170 weight range, and it decked it. The recovered bullet was 78 caliber, and wieghed 152 grains, lodged against the far hide. It tried to get up, and i drilled it again, although the autopsy revealed that this second shot was not necessary.
I think either 180 loadings would be great, but you might ought to try the 200s for deer, they really have earned their keep here. I'm a huge fan of the 350, and its my favorite rifle / caliber. Am interested to hear what you come up with.
Good shooting,
S.R.