I purchased a RCBS hand priming tool about this time last year and did not like it at all. I was as careful as my hands will allow but still had primers going in sideways about 1 out of 10 and had all kinds of feed issues. I was doing it just like the expert in the video only his were...uhm all perfect. I then bought a Lee hand priming tool and it seemed to feed better but I for the life of me can not squeeze the pipsqueek handle just the right amount without going in excess. I loaded 500 rounds of 243s with a mixture of brass. The primers were all just below flush...evidently too far below flush as only half of them were going bang. I had 20 or so rounds whose primers had firing pin dents that looked to me to be deep enough to set the primer off but didn't. I pulled the bullets on the ones with dents but didn't go bang, dumped the powder and knocked the primers out. Each and every one of those 20 dented primers went bang when laid on an anvil and were hit with a hammer so they weren't contaminated. I reloaded those 20 cases and seated the primers using the ram on my Rock Chucker.The primers that I reloaded with were out of the same lot, in fact it was a partial box left from the first reloading. I went to the range yesterday and they all fired fine. A couple years ago I finally dumped my bucket of spent primers from years gone by and it was a heaping 5 gallon bucket full. I have never in my life had an issue with seating primers or primers not igniting until I decided that it would be handy to be able to prime brass from my easy chair, hence my short go around with hand primer tools. This morning I was reading the instructions from the Lee hand priming tool and they commented on how easy it was to feel when the primers were seated to the exact depth....horse puckey! They both went out with the mornings trash!