I have a G21 and when it is stock and loaded with 230gr ball, it shoots perfectly. But when I shoot 45 Super or .460 Rowland I get FTF's. It seems to be that the nose of the Gold Dot Hollow Point bullet gets hung on the feed ramp. I have started to suspect that the slide is moving too fast for the magazine. That the magazine does not push the next round up hard or fast enough to keep up with the slide velocity. I just can't afford to shoot the amount of ammo that I would need to figure this out. It's apx. $1 per round. Any ideas?