Re: .338-404 Imperial Magnum
This wildcat became the .338 Imperial Magnum, which was manufactured in Canada for a period of time. I have a box of brass headstamped .338 Imperial, from the Canadian manufacturer. I have a M70 Express that was chambered in this cartridge for a period of time. Then I eventually had it re-chambered to the .338 Edge. The only difference between the .338 Imperial and the .338 Edge, is the shoulder on the Edge is moved ~0.015 to 0.020" further forward, for slightly greater case capacity than the .338 Imperial Magnum.
I typed "338 Imperial" with the quotation marks, and received 78 hits using this Forum's Search function. Set the "Find Posts from" to Any Date. And set "Keyword Search" to Search Entire Posts.
I've posted information about my .338 Imperial on this forum a number of times in the past. I have some reloading data and recorded MV data from my rifle. If you send me a PM with your e-mail address, I could send you an attachment consisting of some reloading data I kept from my .338 Imperial days.