Thanks to all of you. Great info.

I don't think it'll make a whole lot of difference unless one skates around with maximum loads. Switching to PPU brass I'll be sure to work up to the hunting load I'm now using with the W-W and Rem-UMC brass I'm currently using. (But I have so many hundreds of the older ones I may never get a chance to break open the bags of PPU's that I have in reserve.) Most of my .303 Savage loads are lower velocity mid-range loads and plinker loads, so my brass lasts forever.

"You can lead a man to logic, but you cannot make him think." Joe Harz
"Always certain, often right." Keith McCafferty