I use the 124-grain +P GDSB in my PM9 and P9 with never a problem. Do you give a sharp rap of the back of the mag to your palm to fully seat all of the bullets to the rear? Kahr 9mm mags don't seem to hold the top rounds securely enough to keep them from migrating forward, especially that top round after chambering a round and the next round is pulled forward, waiting to take a dive rather than go up the ramp.
When my P380 started doing that, I replaced the recoil springs, but yours seem too new to need that.
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".