I recently purchased a 1991 model brought it home; scrubbed, Hoppes, soap and water, re-Hoppe's Used Chore Boy on cylinder, barrel, Hoppe's, oiled as needed.
It was cleaned

Carried to first shoot. Shoots okay: Start having trouble? with ejection of spent cartridge. Approx. 150 rds.
Came home: did the cleaning deal again with more emphasis on cylinder; spotless again. Used a complete shell casing, and cleaned until shell would drop out with it's own weight.
Go to second shoot: Shoots okay: Start having trouble ejection again.
Maybe 150 rds. Was shooting other stuff too.
Ammo: Remington 550 count 36grn nothing special.
Give me some ideas.
My thought: NASTY AMMO
Open for suggestions.
Thanks in advanced