The things that occur to me are that you could have too little taper-crimp, and the still partially-flared case mouth is not going all the way to end of the chamber. The OTHER possibility is TOO MUCH taper crimp, and the case is bulged behind the case mouth, having essentially the same effect. Since your rounds tend to fall into the chamber when you rack the slide to clear a jam, I'm guessing the crimp is at or near where it needs to be.
I agree with GUNWONK, that it sounds like your rounds may be a shade too long.
When seating the 200 gr. LSWCs, there is a "rule of thumb(nail)", often used to get proper seating depth. The "rule" is to seat the bullet so that the driving band protrudes ~1/32", or about the thickness of a thumbnail, above the case mouth. If seating in this way does not give good function, a minor adjustment, one way or the other, certainly will.
I am not aware of any similar rule for LRN bullets, except that I'VE never obtained reliable functioning at the maximum overall length (1.275"). For no reason in particular, I seem to remember that I got better function when I shortened my rounds by ~20/1000ths of an inch.
Lastly, I'D recommend the use of a separate taper crimp die, for removing the bell in the case mouth in a separate step. When I switched to one of these for reloading .38/.357 and .45 ACP, my malfunctions vanished, and my group sizes dropped by 1/3rd. Redding makes one, and I think Forster does. BOTH excellent additions to reloading equipment.