Hello mooj,
This has happened to me as well when not removed for a while.
What's worked for me is to add one drop of gun oil at the slide stop. remember that to remove the stop you must move the slide and match the recess in the slide to the forward end of the slide stop first. You may need...
Tim,
I have been using 148 gr. HBWC w/ 3.0 grains bullseye and slight roll crimp. The one issue to remember is to check the case lengths. I maintain a length of 1.150"
Good luck,
Jim