1. Run from Win promo value pack shells.
These cause problems from training to clay fields to dove hunts.
Out of spec, cheap metal is prone to catch as it is not up against plastic, ...etc.
Oh, while I am thinking of it - Win Reduced Recoil has a plastic "ball" that will ricochet. Not good! I mean it will come back at shooter if used against hard targets such as steels.
2. Most shotgun extraction problems are dirty, gritty chambers.
Paper hulls with wax did not cause the problem cause by modern plastic hulls.
Plastic leaves a plastic, dirty, grimy chamber that causes extraction / ejection in pumps, semi-autos, O/U, SxS and single shots.
Take a cleaning rod that will fit into a battery operated drill.
Put some wisps of the finest grit of Scotch-Brite kitchen cleaning pad onto a bronze brush and attach to cleaning rod.
This will clean the chamber.
LEAVE SCREW-IN CHOKES INSTALLED , and continue to clean the rest of the bore.
After chamber and bore is cleaned, remove choke, apply anti-seize, re-install to snug, and good to go.
This is what we have done forever, and those that shoot tubed guns , clean between changing tubes this way.
Tubed guns meaning a 12 ga with tubes for 20, 28 and .410. Same gun shoots all 4 gauges.
Manual version.
Take a cleaning rod and bend so will fit into breech while gun is assembled.
Repeat with bronze brush with wisps of Scotch-Brite.
Twist and turn to clean chamber.
We keep these tools handy , and have gotten so many guns back in the game so many times , we have lost count over the years.
Folks clean "barrels" for some reason the chamber gets overlooked.
One tip is to use a gauge larger brush on chambers. i.e 10 ga for a 12, 12 for a 20 .
Pipe clean the extractor.
Money Gun is a 870 in 28 gauge with ~ 300,000 rds, and still using original extractor.
Many of the OLDer guns are still using OEM extractors with high round counts.
My SX1 has the original extrator with approx 300,000 fired through it as well.
New guns may have MIM extractors. Have it checked, and if so replaced with a OLD OEM, and get a spare for "just haves".
HTH