My favorite .270 win. load of 55.6 gr. of H4831sc with WLR will shoot 1.5 inches lower at 200 yards than with CCI primers. All other components being identical. I noticed in the current Lyman manual there's a comparison with a .308 and different primers. Check the primer section of the book. That's the only comparison I've tried.
By the way....
The way I found out - I use CCI primers in my Federal brass because the WLR fits too loose. Winchester & Remington are fine with WLR. Nice tight fit. Federal gets too loose after 2 or 3 firings so I use CCI. When the CCI is too loose, in the can they go.
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