I haven't used the CXP2 so a direct comparison I can't provide, although I have plenty of experience with the SGK. They are a great bullet with old technology, they aren't like the new bonded core bullets(Accubond and Interbond) however they are very accurate, easy to load for and take down game very well without too much damage. You may not get the weight retention of some of the newer bonded core or solid Barnes type bullets but they still do the job quite well. I have used them in .264 Win Mag, .308 Win, .300 Win Mag, .300 Wby Mag and .338 Lapua all with excellent results, use them with confidence even at long range.
Ivo