My Remlin seems to like cast bullets in the .460 range. When I paper patch they come out around .463 before sizing. I haven't tried it yet but I believe the rifle will chamber that dimension without issue. I read that the sizing is mostly to, " Iron the patch on". It seems to me that if I put a small amount of case lube around the bullet and put it in the case that would iron the patch on just as well.
I ran mine through a .457 sizer. They came out .4583 =+/- .0003 which has to be spring back on the paper.
Is there any reason not to shoot them unsized and let the rifle do that?