The reason a lot (most?) of the top F Class shooters went 7mm SAUM over 284W was with the velocities they were pushing 284s the primer pockets were getting sad after a few loadings. Using the SAUM got the top end 284 velocities without stress plus the tuning of the loads in the SAUM are usually easier.
Then the NRANZ imposed/enforced the range energy limits which meant the SAUM had to be throttled back like driving a Ferrari in a 50 kph speed limit. This makes the 284W a viable proposition again.
With my 284 I was fortunate in that it had a "fast" barrel and my loads were stress free with a 180 gr Hybrid doing 2815 fps, right on the energy limit.
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