Re: Fed Brass vs. Win. Brass & Lee Auto-Prime
Might I suggest you start off developing with a 175SMK, not the 168's.
In regards to brass. Winchester brass is lighter than Federal, or was when I was using it. This translates into more case capacity. The federal brass is soft, and generally will not get as many loadings. For domestic brass, I prefer winchester.
If I had Federal on had I'd starting by dropping the starting load back .3gr or so, but 44gr Varget and a 168/175 is a pussycat load and you should have no problems.
If you're concerned with 210M's, I've had GREAT results with a winch case and WLR standard primer.