This is taken directly from his site.
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The cartridge is called the .284 WRP and is VERY similar to the commercial 7mm STW. The only difference is in the throat geometry. I change the length of freebore and leade angle to make it shoot better. 7mm STW factory throats are not the best design for good accuracy.
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I have still not found any info on what the WRP stands for but should have an answer here shortly.
Dave