Have never heard of it. Around 1970 a local gunsmith tried to improve the 375 like a Brown Whalen, and pushed the shoulder forward a bit. It gained a slight bit over the Weatherby/Aclkey improved concept with 270's, but gained nothing with 300's except loss of accuracy...300's had to be seated so darned deep with that shortened neck that no real powder weight increase was achieved, at least nothing that made much difference.

I would be interested to know what anyone thinks could be done to improve over the slight edge of the Weatherby or AI, and how it works.