I’ve seen over lubrication cause brass rifle cartridges to stick in the chamber.
My Grizzly had a burr right on the back edge if the chamber. It would catch my little fingernail. I lightly sanded that edge and polished the chamber. Chamber should be bone dry with no oil.
Winchester shells?
I tried both kinds, non-brass first. Because this gun spent lots of time in the rain I lubed it well, now I will need a replacement lubricant... or a lubrication plan, I used to oil it every night
Winchester, federal and challenger all stuck at first
OK - So its either a burr, or the chamber needs a bit of a polish. Have a look at the base of a spent shell, look for scratches. Its relatively common for inexpensive shotguns to have rough chambers. This is easily resolved with some fine steel wool - see the various U-Tube vids on the subject.
As far as oil is concerned, I suspect that you got oil on the extractor surfaces that grip the shell. Couple that with a sticky chamber and you've got trouble.

This time it was Hoppe's #9.What kind of oil are you using?
OK - So its either a burr, or the chamber needs a bit of a polish. Have a look at the base of a spent shell, look for scratches. Its relatively common for inexpensive shotguns to have rough chambers. This is easily resolved with some fine steel wool - see the various U-Tube vids on the subject.
As far as oil is concerned, I suspect that you got oil on the extractor surfaces that grip the shell. Couple that with a sticky chamber and you've got trouble.
What kind of oil are you using?
If it's a detectable burr, just polish it off. If it seems the whole chamber is rough, string some super fine (0000) steel wool through the patch fob attachment of a section of shotgun cleaning rod, mount the rod to an electric drill and polish it that way. I'll throw in a caution to test for results so that you don't over-enlarge it, something I would think is unlikely. This is the usual recommendation for fixing 870 ejection problems, at least those that I've seen.
The small automotive honing stones could work to remove high spots
is that rust in the extractor groove? post extractor and spring.



























