Here's a few tricks to try, the first one worked for me with a loose ramrod. Swab the ramrod hole with some Watco oil. Use a cleaning rod with a patch. Swab a little oil in there and wait about a day to see if it's too tight, too loose, or just right. It's best to have the fit a little tight, as it will burnish smooth with use. If still too loose, do it again. If still too loose, try soaking that part of the ramrod with the oil. Wrap an oil soaked rag around the part of the rod that goes in the hole or just stick the end in a can of Watco. Wipe off the rod and let it dry a day or so then check for fit. And again, you want it a tad tight.
If the oil trick doesn't work, then it's time to move on to "crookifying " the rod. Easily done with a hairdryer or heat gun. Put the heat on the side of the rod that bends the most (outside of the arc), then bend over your knee and hold for a few seconds. check the fit and keep repeating the process until you get a tight fit and the ramrod enters the entry pipe without hanging up. You can even bend a slight "jog" in the rod if you're tricky enough. It doesn't take much. Good luck. Bill