Re: 300WM - N160 or N165? - Fed 210 or 215?
The n160 has a burn rate between 4350 and 4831 so may be a little fast for heavier bullets. The N165 is a very slow powder, around Re 25/Retumbo/H870 so could be a good choice for heavier bullets.
H4831SC and H1000 are excellent choices too.
the only way to know about primers is to try them. If the 210M work, great. If you are getting any hangfires, unburnt powder, erratic ignition, then go with a CCI BR2 or Fed 215M. The win mag is not that big of a case and if the Viht powders ignite easily, you shouldn't need a magnum primer.