I found that when using the new Winchester 777 primers.. I could load 5 shots in a row w/ no issues seating the 250 Gr TC shockwave w/ theold black sabot... and this was w/ 120gr of the dreaded 777 2f powder. I was quite impressed. With the same load and the Remington Kleanbore primers... I could get a 2nd.. maybe a 3rd shot if I was lucky.