OK..not a noob by any stretch. I have been shooting for 40 years, and have owned multiple 870's since 86'...Wingmasters, Police Specials, Exp Mags, etc....anyway...I have an older 870 Express that just does not want to play nice. The gun loads, shoots and cycles just fine...that is, right up until I try to expedite the loading process to a "dove field speed." It seems like I have to slow down pushing loads into the mag tube. The gun is clean and has no burrs that would impede loading...it seems almost as if he mag tube is too large, and the face of shells get caught on the mag wall. I don't have an answer.....Anyone here have a clue?