Budwiser - You might want to e-mail Nosler directly and they will send you a copy of the loading data they have developed for this bullet. I checked my Nosler manual and they only have loads listed for the 165gr. Ballistic tip. I'm guessing with the word "silvertip" this bullet is new for the Winchester line of ammo. CEJ..
The 'Ballistic Silvertip' = a Nosler Ballistic Tip with some sort of black coating, I forget whether it is moly or something else, but it is a Ballistic Tip with all of that bullets attributes, both good and bad.
You would be perfectly safe starting with the standard load data for 165gr. Ballistic Tips, working up with all the usual cautions.
If Nosler doesn't have the data you want, contact Hodgdon, there is a ton of reloading data on their site - www.hodgdon.com
I don't know what you are planning on shooting with that load, but from a .300 Win Mag, if you plan eating it, shoot for the lungs, not the shoulder.
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