I had that problem with my P40. I had to increase the clearance of the extractor to the breech face by radiusing the surfaces of the extractor that come in contact with the cartridge rim. Unload and remove the slide to check that the cartridge rim slides up smoothly between the extractor and the breech face.
Wynn
USAF Retired '88, NRA Life Member. Wife USAF Retired '96
Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf
Thomas Jefferson said
“A government big enough to give you everything you want, is strong enough to take everything you have.”
and
"Peace is that brief glorious moment in history when everybody stands around reloading".