I've loaded over 150,000 rds on my 1050s (2) in the last 8 months. Yes, it took me a while to get the priming system to work flawlessly, but as Brian has indicated, one of the keys is getting the primer slide to stop exactly under the priming tube. On my Super 1050 the slide went waaay too far back. I actually had to machine off about .020" from the cylinder shaped bushing that stops the slides rearward travel. The other is adjusting the little white gadget so that you have just the right amount of clearance between it and the case. After that, you're home free.