I recently bought a two year old Load Master, I've loaded about 1K rounds with it so far, (9mm & 45acp). Going from a turret to a progressive, there is a lot more going on to watch. The LM does need to have everything just right for it to work, I can understand why some REALLY hate it. I have a long mechanical background so tinkering comes natural. Other than REALLY seeing the benefit of separating small primer brass from large primer brass, (never 'popped' a primer on my turret, first week with the LM, 'popped' three of 'em. Embarrassing every time the wife stuck her head into the garage to see what I did 'this time'), yes, trying to put a large primer into a small primer case doesn't work. Both large and small primer systems are working just fine, so far. Both the small and large primer systems are the newest ones.