Another comparison of WW296 to WC297, however with different cases so it was not 100% apples to apples:
-- 20.6 gr. WW296, coated 140 gr. GC, CCI 550, RP nickel cases, 1806 fps predicted by QL, 1682 fps actual, 56 ES, huge fireball!
-- 20.6 gr. WC297, coated 140 gr. GC, CCI 550, WW nickel cases, 1749 fps predicted by QL, 1715 fps actual, 83 ES, moderate fireball.
-- my Quickload predictions take the different case capacities into account.
-- my QL predictions use my tweaked powder file for WC297, since there is no official powder file.
-- both powders produced velocities slower than Quickload predicted, presumably because the light bullet did not generate enough resistance to make the powder burn well.
-- but WC297 was only 34 fps slower than QL predicted while WW296 was 124 fps slower than QL predicted, and the bottom line is that WC297 was 33 fps faster than WW296. Since WC297 has a slower burning rate than WW296, the only explanation I can think of is that WC297 is easier to ignite than WW296.
Admittedly that is only one data point with one bullet in one gun. Still, the more I use WC297 the more I like it. To the extent that WC297 is different than WW296 I think it is better -- easier to ignite and less flash. I wish someone would offer WC297 as a canister powder.