[...] Like internet handloading, internet gunsmithing can also be tricky! [...]
Start by determining if there is a live cartridge in the chamber, only a fired case, or it is empty. Slip a rod in the barrel until it touches what ever is there, mark it flush with the muzzle, then hold it along the out side of the slide. If there is not a complete cartridge in the chamber take a peek in with a flash light to verify the empty from the last shot is still there. Hopefully the last three posters' presumption that you have a stuck live round is correct.
I, have a 1911sc e series,shot 20 to 30 rounds great, last round,in, magazine got stuck,[live],can't budge the slide,maybe 1/8 of a inch,movement,magzine removed,ok,need a little help?