Take a look at the 338 Whisper (#1 or first design) it is just a long throated version of the 7 br necked to .338. I Too am a big fan of .357/.358 and called and talked to JD himself. He said he had done about every caliber size he could think of on that case. All worked but he could see no reason to produce them as there was so little diferance. Also the .358 is actually lacking a serious heavy for caliber long slick bullet. the 338 has a factory available bullet (albeit expensive) in the 300 gr sierra Boat tail.
Personally I would love to see you do it ! ( I have a .358 win barrel on a FN/FAL) because I have considered it myself so often.
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Homeland defense starts at home
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