Take a sharpie and color the shoulder and neck area and then try to chamber Multiple times... then look at the case to see where it’s binding up, but remember the contact point might look like a line scratch. You can also “smoke” them with a candle, but usually a sharpie will work... flames and loaded Bullets aren’t the best combination to play with.
It’s more often the shoulder binding than the length of the neck
Match reamers are a bit tighter in the shoulder and neck area, but are the same brass OAL, so I doubt it’s the length of your brass causing it.
You can use a micrometer on the shoulder area of those rounds and compare them to others as well. But the scratch marks in the ink will be the fastest way to see where it’s binding.
