+1 on telling us the type of ammo. If you haven't done it yet get a box of 230 grain fmj round nose and see if it works.
Also what kind of jam? Is the fired case being ejected or is the fired case jamming the works?
+1 on cleaning too and maybe magazine change. Lots of problems are due to the magazines.
Good luck, a genuine Colt Commander should be a joy to own.
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