i shoot 7mm RM and have had the belt problem
after 1 firing my necks have expanded after 2 firings i start getting sticky extraction
after that cases wont fit at all
i was really perplexed until i found Larry Wills's collect die
his dies thread in from the underside of the press making it kinda weird to use but they work like a dream
the top of the die is a gauge so you can drop a case in and see if it needs to be worked
if i get one case in the batch that needs it i run them all through the die
if i dont keep after them and let them get to the point where they wont chamber it's hard
to bring them back if i keep on top and run them through this die at first sign of needing it
it requires alot less movement and i can go through a box of 50 in maybe a half hour
one thing i have found though dont use imperial sizing wax like they say to use
ive started using LEE resizing Lubricant and this stuff it perfect for the collect die
i use a little brush and lube every 3rd case
i can say enough good about Larry and Innovative Technologies