First thing I'd do is pull the nipple and blow air through the threaded hole to ensure there's nothing in the barrel. Once that is done and it's OK, I'd get another ramrod that fits it and use that instead.
Of course I;d clean it also before loading.
I own a bore scope, so I'd run my bore scope down the bore to look at the rifling also, and see what it looks like after cleaning.
Cheap endoscopes are all over Ebay for under $15 and hook to your computer. I paid $13 and have gotten great results with mine for the last couple years. Mine is a 5mm, so fits down even .22 caliber bores.
