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Can't say that I have. I have thought about it, but I then read about the .257 Allen Xpress magnum built by Kirby Allen in Montana and I think I like the dimensions on that cartridge better than the .257 STW and the performance is similar.
If you do build one, let us know how it performs. My problem is that I have a hard time with the diminishing returns once you get beyond the .257 Weatherby and I have not been able to force myself to make the leap. My .25-06 and .25-.284 just keep knocking them over.
Still, the velocity increase is appealing...............
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