Thread: Rounds jamming into lands

Greetings kayneb,
I think that vietnamcam has cracked it. Generally neck dies are set up to size no more than 80% of the neck to ensure that the shoulder is not bulged by die contact as vietnamcam has written. I assume that your neck die is not a Lee Collet die as I can't see any of the lines on the neck that these leave. Most neck dies don't even touch the shell holder. The Lee is an exception and should be set up as their instructions. After about 3 loadings your cases will need to be full length sized to chamber freely and should be sized just enough to chamber freely and no more or head separations may become a problem. Adjusted this way the FL die may wind up short of reaching the shell holder. A lot of the target and long range shooters have gone to full length sizing each load just enough to chamber using the Redding shell holder sets. They also anneal each load to get consistent neck tension. Another problem with belted cases is a bulge developing just in front of the belt. This is controlled with a special die called appropriately a bulge buster die. I don't see any sign of this on you photo's and neither would I expect to with neck sizing alone. Lastly make sure that your cases are kept trimmed below maximum length as a long case can produce both hard chambering and high pressures. Often erratic accuracy as well. Happy to answer questions.
Regards Grandpamac.