I have been reloading for about 7 years and never really had a problem.....I always listened to my mentor who taught me and always followed the load recipe from the books.....and again, no real problems until about a month ago. I use a RCBS rock Chucker press and both RCBS and Hornady dies.
Well I made a couple hundred 243 win loads to shoot in my Savage 243 rifle....went to the range and found that the rounds would not chamber easily....you really had to force the bolt closed to get the round in the chamber. Well, I knew something was wrong, but did I did not know what happened. I reviewed my methods and could not find anything that I did wrong. So I called my mentor, explained the problem and he suggested I check shell holder. Well, I could not remember which shell holder I used as I have both RCBS and Hornady shell holders....so I made one round with the RCBS shell holder and one round with the Hornady shell holder. Low and behold, the round I made using the RCBS shell holder would not chamber but the round made with the Hornady shell holder chambered perfectly. Remember, I made the loads with a Hornady sizing and seating die. Well I always thought the shell holders were interchangeable.......but I guess they are not! So from then on, I always used the shell holder from the die manufacturer I was using. I can tell you that it is no fun to tear apart 200 rounds and reload them. It is a real pain in the but.......so use the shell holder from the die manufacturer and all should be good! Good luck to you!