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It's probably been coated like a .22 rimfire bullet with a very thin layer of hard wax. It should be the stated diameter before this lube is added.
Experts, with S&W using the new electrically cut rifling, without sharp corners, do you believe that this could cause the rifling to fail to grab the bullet?
Rounding off the land's corners will reduce the bearing surface at least a tiny bit, if the lands are identical in size to the standard square lands.
I have no idea if this could be a factor. I can't even guess.
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