Re: 270 Wby brass won't go into sizing die!!
You've described a very common symptom when reloading belted magnum calibers. Your used cases were probably reloaded at least one or two times before you bought them. In the process of resizing, conventional resizing dies bump the shoulder back, and swage the case inward so they will rechamber. However, conventional resizing dies also push the brass back towards the belt, and this usually causes a slight bulge in your case - just above the belt. Read my website, and you'll see how to solve this problem. You'll also see a page with reloading questions & answers, and a page with testimonials about our unique resizing die.
The "top" of our Belted Magnum Collet Resizing Die measures the width of your handloads, so that you'll know when a little "extra" resizing is needed. If your cases don't fit down to the belt, then you can slip the collet over the case, and resize those cases in the bottom of the die. This die ONLY reduces the area just above the belt. So far, over 2,400 shooters now use this die. You to reload cases up to 20 times with this die, and you'll know that your handloads will ALWAYS chamber.