Jimmyraythomason,
The .35x57mm would make a neat wildcat cartridge. I like the x57 part of it, but the .35 part might be a bit iffy. What exactly are you looking for? Is there some particular reason for the thirty-five caliber? Why not the 9.3 mm caliber or the .338x57? I’m guessing you’re looking for a little heavier bullet for woods on deer, ergo; the .35 cal part.
The case capacity of the x57 case would fall in between the 35 Whelen 06 case and the 358 Win 08 case and way larger than the .35 Rem case. So, using the same bullet weight, the velocity would be in between the Whelen and the 358 Win cartridges. So, the only advantage over the 8mm would be the selection of heavier bullets available to the handloader in thirty-five caliber. As mentioned above, the 9.3x57 uses a .366 cal., 286-grain bullet at about 2100 fps and I’ve seen them selling on the internet for about $400. That might be the way to go and save the expense of a wildcat chambering and barrel. Or, maybe it’s a pet project and cost is no object to consider. The 9.3’s have become one of my favorites over the years.
What type of rifle action are you thinking of using for this 35x57, a modern bolt or a single shot?
kerf