Re: 243 and the Nosler B tip
for deer the bts are ok, but i would reccomend the 100gr SGKs, i used them with 42.5gr H4350 and a win lrm primer, shot some outstanding groups out of an ADL.
the partitions are a good choice as well, but i found it much harder to make them shoot well. they held together outstanding though, i raked a small buck up 5 ribs running away at a very tough angle, the bullet looks like something out of their adds, weight retention was excellent.
but if you are set on the nosler bts, go with it, i took some nice bucks with them, even took some does on permit with the 55gr ones.
hope this helps
the .243 is one of my favorites, i just parted with my adl, and am about to build a heavy 243 AI