Bullets hang up with about 1/8" of the case into the chamber.
If I back off the lever, turn the rifle upside down so the cartridge
falls in line with the bore they will slide right in.
That's not a cartridge dimension problem, rather that's a feed angle issue (and a gunsmith correction).
Do take it to a pro who is familiar w/ the action and let he/(she)decide whether to attack the feed
ramp or the elevator mechanism.